A possibility???
Are they welded?
If they are still 3-piece bolt together wheels you should be able to change the backspacing by buying different inner and outer wheel shells. I'm not sure what the bolt pattern is around the outer rim, but you might be able to call another 3-piece wheel manufacturer to see if they would sell you the shells. The few that come to mind are
Forgeline
DPE
Fikse
I'm sure their are others. It might be worth a shot.
Later,
Brandon
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