Dope cards? That is what we did 15 years ago before the PDA and ballistic app. Today we have kestrel and phones with amazingly accurate apps that take care of the issues. A dope card goes in my pack for the off chance I have an issue with a device. At most I may have 5 cards for the areas in which I will hunt. With a little experience, especially 500 and less, you'll not see that much difference unless going from one extreme to another, which is rare. You can literally use one card and make small adjustments. So if you are set on a card, make a card, and play with your app for the average. I bet you find very very little difference in a 2000 ft elevation change and 20f temp swing to 500.
Zeroing. Most rifles zero changes very little from temp and elevation unless you have very sensitive powder. In that case, it's all about the temp and you zero is likely only going to be effected by the change in velocity. I may zero at 2800 feet and hunt at 9000. My zero doesn't change, so it's nothing I worry about.
If your ammo and rifle profiles are dialed in with extremely accurate data all you have to worry about is accurate ranging, accurate atmoshperic input, wind call, and shooting fundamentals with a excellent stabile shooting position. In the end, wind, and fundamentals are your biggest problems to face in the field while hunting.
I don't disagree with the use ballistic apps, just depending "solely" on them. Murphy's law. Pretty easy to hang a dope card off your scope, tape it to your stock, etc. I'll never depend solely on my phone / app etc. that's just no bueno IMO.
these here are pretty handy