Here’s an idea:
replace 1 of the trainer ground slots with:
A training ground that exclusively produces trainers.
Probably Burts most of the time, but with at least some prospect of any given trainer.
The obvious choice would be to get rid of Advanced Training which I feel comfortable in assuming is the least used training ground option.
If that isn’t already too much to ask…
Have us be able to pay for the trainers using wood.