Hope you don't mind Q but I took your downloads and made them easier to implement in the game. I took your downloads and put them in one folder that goes in the mod folder of the game directory. All one has to do now is put the mod folder I created and paste it in the mod folder of the game directory. When starting a new game just choose the mod from the drop down menu and then select the custom schedule in the next screen.

I also added some mods to your schedule and made another mod if one wants to use it. This mod has qwsa's schedule and showcase and I've included my UK Jockey and Trainer lists and a Stable list for 2018 which is 100 strong for each. Also added were Jockey and Trainer lists and a Stable list for Ireland and France but these two are only 20 strong each. Included also are my Stud Farm files for these three countries.

Hat tip to qwsa for the fine work on the schedule and showcase files.

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Instructions

Download zip. Extract to place of your choosing
Inside the zip are two folders - qwsaMod and qwsaSCMod. Copy and paste these folders to ~Program Files(x86)>Starters Orders 7>mods
There are also two files - "sched_f_qwsa.db" and "sched_f_qwsaSC.db". Copy and paste these two to ~ Documents>StartersOrders7>exports>schedules>1

You must start a new game for these to work. When starting choose the mod you want from the "available user mods" dropdown list. Then choose the corresponding schedule on the next screen from the custom schedules list. The schedule is pretty big so it takes the game a long time to create the schedule at the beginning. Don't lose faith. It will(should) eventually get to your stables screen.

https://www.mediafire.com/file/vze3xg92zhjcnyn/qwsaSCmods.zip/file

Basic question when opening up the files.
Can certain "periods" be set somewhere. The real race-meets. I tend to see several dates in Diary on tracks that clearly never had any races at those times. All races named in the files are OK, but beside these the game find new dates on certain tracks. In many cases way out from were they normally held any races. I hope you get what I'm asking. Beide dating certain important races it would be good if one could restrict race-dates on certain dates for the different tracks. Like the classic dates on Royal Ascot.

I had the ambition to mix in certain races from your different mod sections. Like Ky+NY+Cal and son. What I'm struggle with is in fact those first lines of the _sched databse file.
[pool]7500
[fpoolperc]25
[secondary_nat]Australia, Canada, France, Germany, Hong Kong, Ireland, Japan, New Zealand, South Africa, Singapore, Dubai, United Kingdom
[sec_trainers_max]aus=20,can=20,fr=20,ger=11,hk=20,ire=20,jap=20,nz=20,sa=20,sgp=20,uae=15,uk=20
[sec_jockeys_max]aus=20,can=20,fr=20,ger=11,hk=20,ire=20,jap=20,nz=20,sa=20,sgp=20,uae=15,uk=20

The pool is horses for all those nations I guess, but the perc is the procentage of the horses in those secondary nations or in USA.
The reason I intend to increase it a bit since I will have that merging of some areas of racing in the USA.
I wouldn't go as far as the StartiT mod, since I would land on a middle way perhaps.

Maybe I would take away some of those 2nd nations too and see how it will affect the game.
Adding trainers and jockeys to some of course, like UK with some more races in UK.

Settings
The Pool size can be changed. Take care. This the total horse pool
size (including foreign horses).
The foreign pool percentage can be set via and is the total
percentage of the horse pool allocated to foreign horses. Note that the individual
locality pool sizes (allocated within this percentage) depend on how many feature
races exist for the locality.
Secondary Nationalities
You can allocate secondary nationalities via the list box.
A secondary nationality means the trainers/owners under that nationality are more
likely to send their horses to target the main localities premiere feature races. For
example, Ireland is a secondary nationality to the main English schedule

0.105 Legends starting date fix.
Option to set non local trainer count. Add trainers and stables if required to data files and then manualy add a [sec_trainers_max] tag to the schedule header for nationalites you wish to change in this format. Eg: [sec_trainers_max]fr=20,ger=15,uae=15
Jockey count. Same as trainers (above). [sec_jockeys_max]. Report any issues.
Minor schedule (non feature) tweaks.