I just happened upon this old post, thought I'd check in and share an idea that I'm going to try as soon as I get the tools. I have an S22 Ultra and an old Defender case that needs to be replaced. I'm thinking I'll buy a Magsafe ring adapter and stick it to the phone then use a Dremel to grind away the plastic case to make it fit flush under the silicone. So long as the Magsafe components don't need to interlock with the magnetic ring, the magnets should be strong enough to pull through the silicone, but it might slide around.

I am the person with the original question. I bought my new iPhone 12 Mini back in December 2020. I did NOT get an answer quick enough, but I still bought the Otterbox Defender Pro case from Best Buy back then anyway. It works fine for my needs. I found out that the Otterbox Defender Pro I ordered, which was less expensive then the PRO XT is not designed to work with MagSafe. I decided I didn't care about that MagSafe feature since I found out the the total cost for both MagSafe charger and the higher priced OtterBox case designed for MagSafe were too high for the little benefit it gave me. The MagSafe charges only at 15W. So it is a slower charge, but convenient. I rather have a faster charger. My new RavPower charger is 65w (but you still have to plug it in) and it auto regulates the power as not to damage the iPhone, MacBook, etc. It has dual output ports so you can charge more than one device at a time. One port is for the new cable that came with my iPhone 12 Mini (USB-C) and the other port is for USB-A. Oh by the way, I still had to buy an additional clear shield since the new Otter Box Pro Defender doesn't have one built in like my last 6 Otter Box Defender Pro cases did for my older models. Hope that helps!