'Offroad' tires come in lots of different flavors, from a full agressive knob through to patterns that look like rain tires.
I'm still learning about the differences, but at a given price point I understand offroad tires will be sitting somewhere along a continuum between onroad grip and wet performance at one end, and grip in loose and/or slushy stuff at the other end. You can pay more for something like a TKC80, which will give you respectable performance in both conditions, but do wear quickly.
So back to the 'two sets of wheels' question. Yes, you can run two sets of wheels, with dedicated sets of tires. If you want to swap them over you'll also need to swap over brake discs and rear sprocket, unless you can afford to have a spare pair of discs and a sprocket attached to your 2nd set of wheels. If you don't want the hassle you could run a road oriented tire and one set of wheels. It would also save you having to worry about the speedo reading incorrectly if you are running different sized wheels.
Suspension wise, run a bit more dampening on road, a bit less off road.
The only 250cc factory Mo'Tard I've seen is the Kawasaki, which I think I posted in the other thread. There have been 50cc 'tards, but they look more like pit bikes to me.
A full conversion from a trail bike would look like this to me - hubs laced to 17" rims, resprung/revalved suspension, upgraded front disc, upgraded front caliper, upgraded master cylinder, maybe different sprockets, and different can.
To me the idea is that you upgrade stuff you need to. If suspension is ok, but you need better brakes, then think of upgrading the caliper and disc.
As for gear I think you'd find a full face more practical than a mx style lid with goggles. If you want to do foot down riding on the road, you might need to consider a boot with a replaceable sole.
We're all fucked. I'm fucked. You're fucked. The whole department is fucked. It's the biggest cock-up ever. We're all completely fucked.
-Sir Richard Mottram
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