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You need to research the 'Doctor John' Moto Guzzi racers.
He off set the drive shaft to fit wider rubber.
Can you weld?
You may have to learn.and build a new swing arm, then you could go to a more common 180x17 rear tyre.
You CAN offset the rear wheel but it does cause problems cornering one way or another plus you have to counterbalance the offset. Many manufacturers have done it but usually only 1/4" or so.
Most common is Harley Davidson, but, you don't normally talk about good handling and Harley's in the same sentence.
I forget which model HD (early one, 1940's/50's) but you set it up with wheels pointing in opposite directions as the torque pulled things back in line
 

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Yeah, I kinda forgot how much obscure nonsense I've found out over the years.
Had some great 'discussions' with the Harley instructors at MMI
 
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