hey i feel your pain regarding having stuff that is esoteric and no one local to fix it...
the solution of course is to switch the lacing from X-lace to conventional,,,
this is accomplished by several techniques
1,,drilling out a set of nipples to be used as an adapter for filling the old nipple hole to smaller diameter spokes,,,this system routinely loosens up because of seating issues and the spoke bend being too far away with no support..
2,, the buchanan technique of making special double threaded spokes and threading in the hub nipple first,,,have re-done several because of the tendency of spokes snapping at the bend right where the threads end...the weakest part of a spoke
3,,the bullet proof special Monzter spoke kit,,essentially a swedged 4gx.175 spoke custom speced to fill the hole,,,
looks like this:
of late we have been sending superlace kits as well as tire sealing kits to folks in far off lands,,to minimize S&H expenses....your local wheel wizards should have no problem lacing/truing these set-ups,,,we charge a lil extra for blue printing the rims
hope this helps
for more details ask these questions in the special ''ask woody about oyur wheels ''thread in the vendor section.
if you are spending so much time in the dirt and happen to ride hard enought o bend your oem rims,,perhaps consider going with a 21'' while you are at it,,tremendous improvement,,quite a few mates have converted...