The only problem with that is everyone else heading to Mine Train is thinking the same way, so unless you're at the very front of the pack on one of the first loads it's a crapshoot. Even then you'll be competing with the EE stragglers who came into Fantasyland, saw the Mine Train wait already crazy, and just kept going to PPF.
I would just go to PPF first. If you can be there that late, SDMT is really best saved for the end of the night imo. Rope dropping that ride is an exercise in misery and tbh you'll get more done by starting in Tomorrowland even if you don't do Space. Mine Train usually drops to like 15-20 minutes right after the fireworks and again right at park close.