You can always go with SF training. It is slower, but it could pay big in the end. Here's a plan.
I would pick 2 players that could make good SF. Probably Figueroa and either Gandy or Garcia. Train them with one position training at PG for half the season (training in one or two of these: OD, PS, JS/JR, HN). Then spend the other half of the year one position training them at PF (training in one or two of these: ID, IS, RB, SB).
Gandy might be a little tall for the outside training, but he is 18, and the training will help make him a great all around PF/C some day. Really the main player you would be training is Figueroa. So train the things he needs most. Probably OD, JS, ID, IS. His only weakness is IS, but it moves fairly quick especially when he is young.
When you train these guys to get 48 minutes once a week, you will have the ability to add another player to the mix to get training. so another PG would get some training, and another PF/C will get some training. Now on some weeks, your minutes might get screwed up, but you can switch to 2 position and train PG/SG or PF/C on those weeks to make it work out, and more players will get training. Or you could just plan to give a few weeks of 2 position training in the mix.
I have been training this way for a couple seasons, and it is slow, but I think in the end you will be very happy with the results for the SF trainees. They are hard to find.