You’re thinking the right way - manufacturers and dealers both are quite screwy about transmission service. Of course, who will be standing there with checkbook when the thing goes? The dealer gets to receive the check.
I don’t know this transmission’s specifics, but the ideal would be that it has a removable pan with a serviceable filter underneath in which case you’d have pan/filter service done every 30K. If it only has a drain plug without a serviceable filter a simple drain & refill would be fine.
If none of the above I’d go with Dealer #1.