My rule No. 1 is "don't fix what ain't broke". So if the wheel is OK now, there's certainly no reason to take it apart to try to make it more OK.

I doubt that any adhesive will work if you've greased the nipples, but the grease itself might be sticky enough to do the trick. Or you can thin a very thick, sticky grease (like water pump grease) with naphtha and apply it the way I described.

OTOH, if you continue to have problems with left nipples loosening, then you might try cleanin g the grease and spinning in an adhesive to bind the nipples to the rim. That said, the real solution is to address the underlying cause which is inadequate elongation of the spokes. Either increase tension on both sides, or if pushing the limits on the right, use a lighter DB spoke on the left.