Instead of the "spiffy (expensive) fork oil level tool", the easiest way is to buy/use turkey basters.
Measure from the tip of the baster to the proper fluid depth and make a nice visible mark.
Fill fork with oil. Stick in turkey baster to mark and start sucking. When nothing else gets sucked up, you have the correct amount/level of oil.
Quick. Simple. Cheap.
Enemy of fun