Thanks for clarifying. I don't have a POD device. Rather than spend the $100 for the USB interface, I think I'll start by purchasing a replacement saddle.
After you fix your E string's piezo, and you like the guitar a lot, I highly suggest investing in a way to use workbench. It's absolutely fantastic if you want to use alt tunings or tweak your virtual guitar's specs. Really fun. Adds even more depth to an already amazing guitar.
I know I couldn't get a 600 without the workbench interface, that's for sure.
Either way, good luck on the repair. I believe Line 6 actually restocked their piezos after a long time of being out of stock, so it's really awesome to see that they are in fact still supporting semi-common hardware malfunctions of the old Variaxes. I really appreciate them doing that.
You can also order an X insert from LR Baggs, which is what I did when everyone said Line 6 isn't restocking. It's basically the same exact piece, but maybe a little different internals, according to the guy i spoke to on the phone. (He says Line 6's piezos are produced by Line 6, and the X inserts by LR Baggs themselves)