I found a skid plate that fits the base Templar pretty well all things considered. Unfortunately they sent me blue when I ordered black so I need to exchange it but since I had it I tested the fitment and it ain't bad. The included mounting bracket works and it looks pretty good on the bike. There is a hole in the back that lines up with a frame crosstube and can be attached with a zip tie. The base Templar frame gets much wider at the foot pegs so it will fit better if I heat up the plate and flatten it a little or cut away a bit in that area.
I was considering making one from a HDPE cutting board but this is a lot less work. I wish I had a heat gun but maybe I can use a propane torch instead. Let me know what you think about the fitment.
The skid plate is
Cycra SKU: 1CYC-6206-12 and fits 2010-2013 Yamaha YZ450F.