Does the H7 range have more flexibility on the alternate function mapping?
In my opinion, not fundamentally, they still use the same design paradigm:
1) List peripheral instances on the wall
2) Write pin numbers on darts
3) Organize well-being week for new summer trainees
4) Make them blindfolded and throw darts facing away from the wall, over their shoulders
5) Now you have Alternate Function mapping
So you need to look and hope for the best.
Thankfully for H7 series they don't use this same paradigm for DMA channel mapping anymore. Any peripheral is accessible to any DMA stream (see DMAMUX).