OK so after a little bit of reading, tweaking, experimenting etc... I was sold on the Boss Katana amp. I read here of a guy that was able to use the acoustic mode of the amp and tweak the EQ to make it close to a FRFR powered speaker so I decided I was on the hunt and trackd a 2nd hand Katana 100 for a few bucks.
ALL OF THIS IS AIMED TO USE THE PROFILES WITH CAB SECTION OF THE KEMPER-->BOSS KATANA INPUT -->ACOUSTIC MODE/CHANNEL
(going into return of the amp is easy and great sounding, but you miss the cabs of your profiles)
Mind the the amp itself is great, and I mean really great with amazing clean-crunch-lead-BROWN!! modes+ built in boss effects, so it is a solid backup.
I started tweaqing the eq section in acoustic mode and did not seem to achieve anything close to what I wanted ( had a yamaha studio monitor to compare), then I read again about this guy and noticed he had been tweaking a parametriq eq of the amp, which is one of the many virtual stomps you can program in the Katana chain, so I started tweaking, I got close enough with that, the image attached is to show the settings of katana'sparametric eq.
But still there was something quite not right, some high mids that I could not dial out, then playing with the cab section of the Kemper I found the sweet spot I was looking for: Character to be dialed out to -5 (far left).
I perfectly know that a FRFR powered speaker would be the proper and accurate way to go, but if you have one of those amazing Katana as a backup try this trick and tell me what do you think of it