Welcome to the land of compromise. Once you've actually picked a bike, you'll need to figure out a compromise on tyres, helmets, gear etc etc.
On one hand, you describe the CRF300 as gutless and the DL650 boring, but then don't want more than 100hp like your R6 (ie, more premium bikes). You've identified the budget suspension in the CB500X, but in reality, even something like the Tenere 700 suspension is criticised.
So, you've got a few odd balls like the KTM 390 Adventure (actually quite popular in its segment), or the KTM 790 Adventure (non R to be less dirt biased). No-one has mentioned the large range BMW has (I skimmed OK, so I might have missed something), from the older stuff like the F650 Dakar, to the newer 6-700cc bikes. Suzuki has the DR650 (probably too dirt for you, and a competitor to KLR650 with a different twist) or the DL. Kawasaki has the Versys in a few capacities.
If I was you, I'd ditch the R6 (but you probably love it having owned it from new) and go for a KTM 1090R - I own one. Absolutely ridiculous on sealed roads, especially if you're trying to lay down 125hp on knobblies but can equally cruise down the gravel... and by cruise I mean sideways at every opportunity. You'll understand if you ride one

If you find your rubber lasting too long for your liking, KTM offers a 1290R with 160hp ish.
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