Sadly... not really Dave.
3R wheels are 1/64 no matter how many ya cram, shim or shave on.
Some guys get away with using machined alumminum fronts. You know...the snazzy slot dish ...and the boring old ten hole centerline. (cant think of the guys name). I've found them to be rather delicate and meatless in the hub area...coincidentally right where they need the most chub for some thread bite on the axle.
I've polished up and used the old aluminum cigar box wheels. Naturally they are a press on affair and they wont hold a tire under duress unless you glue and true them. I rekon a guy could easily thread them to fit the 80 count axle. By shaving the back face of the ciggy rim (there's some excess) and taking a few strokes off the nut ya just might get it all packed in there.
Edit: Had to go spelunking for this pic ...LOL! One of my early restos from the before time with the aluminum ciggy rims pressed on.
BTW: Dont forget that MEV provides smaller style plastic rim in a rainbow of colors as well.