I have the Hi-Vis rainsuit in Med. And my inseam is 29. No problem at all, especially sitting down on the bike. The bottom of the pants are velcro around the circumference. So with my boots on, I can just let the rest bunch up slightly above my ankle and fold back down. Almost like Army combat pants. Never has a problem with wind either.
Just measured my rain pants, inseam is 30". Crotch is rather loose fit. So for longer inseam, I don't think is an issue either.
Try it out at your dealer, you'll be happy with them, rode through several heavy downpour, stayed completely dry.