If you can get it out, sure. It shouldn't be pressed in as neo magnets are somewhat brittle, but it's likely not loose either. May have an adhesive too. Probably wont be able to drill a hole in the back to help push it out, gearsets are almost all hardened steel these days - a diamond tip grinding bit will get through it given enough time, anything less will just get dull ime.
SHS is perfectly fine, you can pay more if you like but you don't get much for the extra $$ other than perhaps a warranty.
Here's a thread
from someone that got 12s working in a CA but had to much overspin to deal with and gave up - might be able to pick up where they left off?
In case link dies, here's the takeaways:
2/10" dia. x 1/8" thick, Grade N42, Axial poles
Polarity may matter, match the stock orientation
Magnet needs to be over sensor when shell put back together
Will get overspin