If the TX guy has already disassembled yours, then you should be able to get measurements from the bearings that need to be replaced (I'm talking micrometer type measurements though). With those measurements, you should be able to buy a COTS equivalent bearing that just doesn't have Isuzu's number stamped into it.

Years ago, when I was rebuilding a tranny on my Samurai, I was having problems finding some of the bearings. One bearing issue was solved by Suzuki. They no longer stocked the "OEM" bearing but cross referenced it to a newer part. The only difference between the two bearings was that one was sealed & one was not. The second issue was solved by myself & a buddy who custom made airplane parts that were no longer manufactured. We basically lathed a brass bushing to fit in place of a bushing that could no longer be ordered.

After having said all that, the point is that you can probably get'r done but you'll have to think outside the box.

Maybe it's time to check into a used transfer case to get your VX running while you collect the parts to rebuild your original.