I use a very successful 2 pos training model. Here it is:
League Games
2 starter PG, SG, Backup sg and back PG, backups are also the 3rd string
Scrimmage:
Back up PG and SG(from above) are listed as the Starting PG and Back up PG
SG is a another trainee and is listed in all SG roster spots
Using this system, I am able to get the 5 players 48 minutes almost every week. This works if you are having blowouts almost every league game.