Oh, they have it, or something close, but it may not be ideal or easy to do. Access is the thing.
Hard to get to that adjuster ring!

It's VERY COMMON ... in fact pretty much standard procedure unless you have a custom made tool. Standard "ring spanner" tools may not be ideal. But if you have one, try it. I think you'll be back to bashing soon! Make SURE you elevate rear wheel ... makes it MUCH easier to move ring ... and OIL IT.

Keep in mind that adding Pre-load to your shock spring is only a Band-Aid solution ... what you really need is a stiffer spring. (probably 15% to 20% stiffer) Standard DR spring rates are VERY VERY soft. Both ends need up grading for loaded up travel.

But adding pre-load will help a bit, should help with bottoming out and keep the bike riding more in the middle of shock travel. Ideally, you should ride in the upper 1/3 of suspension travel.
I'm guessing you are now riding in the bottom half.(not great)

Pre load increase should raise up rear end a bit, give a more positive feel, better steering. The DR will track better and be better in Ruts with a raised up rear end. Ruts will KILL YOU. (Cross Rutted)

The Side Stand should be easily modified by any good welder. SHOW HIM the problem you're having ... stay there at the shop and GUIDE HIM, do NOT go for Coffee, make sure he does it right.

WARNING: Do not let the side stand foot hit the swingarm when in UP position! Danger! It will CUT through the Aluminum and ruin the swing arm.
That could end your trip! So leave clearance there!

Have Fun! Ride Safe!