I wouldn’t bother trying to make it ‘too gravel’ as it will ruin the bikes main features – which not far off an all rounder as it is.
I ride a carbon Chameleon with plus tyres and it is not really that slow on 2.8s. Recently I put 29″ wheels on and found it too stiff for my aging body, so went back to the 27.5″ but with newer lighter wheels and a change from Nobby Nics to Rekon+
First ride today and it felt great. Lighter wheels seem to change the feel loads, but not the character of the bike.
For some reference, I also have an On One Whippet that whilst build up as a sub 10KG rigid with 2.1″ Racing Ralph and Ray tyres, was about 10% faster than the plus tyred Chameleon over all, with maybe 20% faster up non techy hills and 20% slower down.
All in all, I’d suggest a Chameleon should be left as a do it all bike and not pushed too far towards the skinny wheels.