Adding a second arm to a Rega P3-24, Question.

First a follow up. A few months back I posted about a getting a new table. Lots of great advice and feedback. In the end I got a darn good deal on a dealer disc. Rega P3-24. I've had it for a few months now and have come to enjoy its musicality and simple clean set up. I have a Denon Dl-110 put on it. Nice synergy IMO.

I as just thinking. I have a second table fitted with a Grado Mono cartridge and the table is a good condition vintage JVC QL-A5. But what about buying another tonearm likely a Rega RB-300/301/303 and mounting it on the back left side of the P3-24 plinth to then run the mono cartridge? Surely it would fit, but I wonder if or how it may affect the sound or such of the P3-24?

I mean it would be a rather easy mount and as such would allow me to run my Denon stereo cart and my Grado mono cart all on one table.

Anybody done this to their Rega's? Any further thoughts?

Thanks in advance