I too have many mono LP's and enjoy them very much. I think a stereo cartridge is fine for modern mono pressings.
78 RPM mono records are another story. They are cut vertically and require a different cartridge to play properly. Benz Micro manufactures a mono 78 cartridge designed especially for the purpose.
If you decide you must have two cartridges and do not wish to give up your Linn, consider a tonearm with a detachable wand. Careful planning with cartridge mounting, spacing and weights allow that second cartridge and wand to "plug and play" with only volume adjustment.
78 RPM mono records are another story. They are cut vertically and require a different cartridge to play properly. Benz Micro manufactures a mono 78 cartridge designed especially for the purpose.
If you decide you must have two cartridges and do not wish to give up your Linn, consider a tonearm with a detachable wand. Careful planning with cartridge mounting, spacing and weights allow that second cartridge and wand to "plug and play" with only volume adjustment.