I come from SonA. I used to spend a lot of my spare time exploring the back lanes of the Cotswolds on a VF1000, on street tyres, when I wasn’t riding my '81 Montesa in organised trials.
They’re roads, you have a road bike… I don’t see what the problem is, let alone how a ‘dirt-bike’ would solve it… unless you want to start gong cross country, on ‘dirt’?
Most of the Charlie wannabees out there now, on KTM’s and BMW’s don’t need half of the capability of a full on enduro bike, with MX derived long travel suspension for soaking up 60mph areal acrobatics, for a ‘bit of green laning’ where there’s a blanket speed limit of 25mph for anything unsurfaced, anyway.
And you certainly don’t need that much suspension for soaking up a 2" pot-hole in a bit of broken tar!
Those roads were there long before pneumatic tyres, let alone long-travel multi-link hydraulic damped gas charged suspension… My old Grandad was tearing around them lanes on a Rudge Rigid when he was a boy!
Old fashioned reading the road, and riding to the surface conditions has always served well in the past; yet for some reason these days whenever we cant do something, we look to blame the machine!
So, there’s my ideas; a bad workman blames his tools, and horses for courses; a road bike on public roads ought have far fewer ‘compromises’ than a track bike used on public road or a dirt bike used on public road, or a compromise ‘on-off-road’ trail bike used anywhere!
So what is the real problem? Specifically or generally you are trying to solve? If its ‘grip’? Well, tyre choice or even tyre pressure can make huge differences to how a bike handles; and maximising available traction; BUT if you are riding beyond limits of traction or not riding to the conditions to begin with… all it will do is change how far you get and how fast you are going when you find the limits.
If its uncomfortable cos of the bumps? Again, tyre pressure, tyre choice and suspension settings; maybe even alternative dampers MIGHT help… but again, if you aren’t riding to the conditions, likely only to change the crash-point.
What about a trials school or off-road adventure day? Old bit of pit-lane lore; “Want a better bike? Fit a better Rider!”; little bit of learning ‘loose’ riding could do far more for your than trying to change your bike, and would work on all your bikes, and any other you rode, not just the 65.
Just a bit of out of the box thinking…