It is in fact illegal for a vehicle manufacture to deny warranty claims because you've (competently) completed your own vehicle service, or had it serviced by a qualified independent technician rather than the dealership. They will certainly try to though, and this is why it's important to save receipts from materials (oils/filters/etc) purchased, and keep complete detailed records of service performed. This is the exact reason I made this log, to keep along with my receipts as a detailed account of the thorough service I am completing myself.
I had a friend come over and watch me do the 1k mile service on my bike (and give me a hand here and there), and it took about 2.5 hours and 4 beers. We both agreed there is no way the dealership (which in our neck of the woods charges $500 for this service) would do all the items on the checklist, but since I did it myself I know every bolt/screw is properly torqued, and only the finest fluids were used. This was my first major service on a motorcycle I've done myself (I've previously only done simple/standard oil changes), and it felt great to complete it myself, and after a short test ride my bike to seems to be pretty happy too!
Note, while doing the service, I caught a few items I put in the log I made that don't apply to the FLHX/FLHXS, so I removed those items, and also added the torque specs for the drain plugs and derby cover screws (for reference). I've updated the link in the original post...