Magnetic Mini Bases for Resident Evil 2 (20mm, 40mm, 80mm)

I'm going to start painting the minis for Resident Evil 2. Once I do so, I'm going to need some way to transport them without damaging that paint job, so I made this set of my magnetic bases (https://www.thingiverse.com/thing:3442245), except it is sized appropriately for these figures! My intention is to remove the minis from their original bases and attach them to these after I finish painting.

These bases are made with cavities in them so that 3/4 inch steel discs can be inserted into th