I would strongly recommend running the guitar through the PA, regardless of your monitor set up - using your amp for backline is always a poor compromise.
I never gig without the guitar miked, even in the smallest venues, as there is little control on the FOH sound. You might think you sound great but out front you will blast those at the front and people at the back won't hear you.
If you sort this, the focus changes and your monitor becomes less important. I initially ran my KPA through a 4 x12 for years, miking it up, not realising how much the cab adds colour, not always in a good way. I then shifted my focus to the FOH sound....the most important bit....what the audience hears.
Thanks..I think you misunderstand me. This is for rehearsal ( which happens 1,000's of more times than live performance (Which of course we go direct out of the Kemper into the PA..)
For rehearsal, there is a small PA we use just for VOX..no monitors, just mains. I need "air" behind me. FRFR cabs are not for me on any level. Never said I mic'ed up my cab. I'm just playing live and loud with the band. Other guitar player runs either Triple Recto half stack or Marshall JCM800 1/2 stack. Nobody is mic'ed up...