Advice needed for adding single coil to MM90s

I’m considering installing a middle single coil to my Axis Sport with MM90’s. I’m hoping to get a couple more tones by doing it as well as pickup up a hint of the 2 and 4 position sounds that you get from a traditional 3 single coil setup.

Any recommendations for a pickup to use? Anything I need to be aware of or consider regarding output or anything?

I love my guitar but for years have also wanted an old Sport with 3 single coils. Now I’m thinking instead of searching for that, why don’t I just add a middle single coil between my MM90’s.

Any thoughts on this? Thanks!