FE350 supermoto for long distance trips. Is this a stupid idea?

Kind of got the interest to an FE350 with low hours.

I know its purely an offroad focused machine and that long highway runs aren't good for the motor. The kind of distance I want to do is 300mile days about 2x a month.

But what if it's got supermoto wheels and re-geared for highway use? I'm thinking that would be easier on the engine while not revving it like a maniac.

PS: 501s, 500s and 690s (would prefer newer models) aren't available in my country.