Be aware that valve stem hole sizes in the rim may vary.
Going with a larger stem can be done. Just carefully ream out the existing hole. Though I would not like going that route. But that is just me.
I would not go smaller.
I was considering going to the angled valve stems whenever I needed tires, but as an interim measure I bought the extension hose from HD. Guess it is maybe 6" or so long. Works good. I can reach down under my right bag and screw it on without even needing to see it once I have the valve stem at about the 7'oclock position. And I have found then when unscrewing the extension as fast as I can I still lose 1/2 lb. of air pressure so I just add 1/2 lb. or so to whatever pressure I want when airing up. Carry the extension hose and tire gauge in a bag. Won't be buying the angled stems now.