Ya got it about half right...I'm not sure what a "reverse seat deep dish wheel" is, but mine are one inch wider than stock, & pretty close to stock offset...just four inches larger in diameter...
The reason I don't air down is primarily rim protection & secondarily because, as you mentioned, it's a PITA with those valve stems, which I chose on the basis of appearance, rather than necessity.
Back when I bought the 20's, I was running street tires & had no intention of taking the she devil off road.
Then the dirt bug bit, & the rest is history...![]()