I replaced my ring with these and never felt safer
That last product photo sold me. (CNC’d and hardened vs drop-forged).
I have a Dewalt security bit set that I paid the same amount for at mothership Amazon, but many of the bits are off-center like that photo.
Note, if you wish to keep your microwave running rather than throwing it out, the most frequent failure is a cheap but very standard micro-switch in the door safety interlock. The screws on the back are often Torx-center-drilled.