Hey, let me know if you're interested in a custom extension piece from IND. We can try to do a group buy.
I've emailed them for a price quote for an extension adapter (behind the boot) that extends the stem by about 1 inch. So this piece would snap in to the OEM stem on one end, and your knob on the other. And I suppose since IND will be making a few at a time, you can ask for different lengths. Let me know if you're interested.