I think improvement for mono can be achieved, but subtle.
LP's with grooves compatible for advanced stylus shape would benefit from change from spherical or elliptical. Most flexible would be a MM mono body with various stylus options you can swap into the cartridge for a specific lp, I may go there myself.
I would coincidentally think more about what would improve your stereo lps, small qty existing, and future.
that might lead you to consider a longer arm, changeable headshell, two arm deck
ease of VTA adjustment might be a consideration when choosing an arm