Trans States has a program where you can show up to a day of ground school and "reserve" your seniority. I think they'll adjust your DOH 90 days to left of showing up to ground school.

I know they're not an APC consensus recommendation unless you need Denver day one, but that might exist elsewhere. I wanna say Envoy had something similar when I interviewed there a few months back, but a quick look at their hiring page shows that they've changed things significantly since they've got the new TA (good for them!)...and I see no mention of it anymore. Anyway, something worth looking into for OP.

As for rotor transition programs - I'd suggest asking what the training department does for rotor transition folks, how many they get, what percentage pass, and how they've adapted training to accommodate them. There's big learning curve from single engine light piston VFR to swept wing jet IMC. Not everybody uses their 250 hours as productively as they could have - does the airline have a system in place to help rotor pilots make the jump? Obviously you want to be tactful when you ask, but if you're deciding between two places and one has a good track record and one doesn't...well it's your PRIA record.