I have found out that you can encrypt messages on NFC tags, this has led me to the idea of using them as parts of an even more secure paper wallet. I have checked the lifespan and they seem to have 10,000 read/write lifespans. I have quite a few of these from a project ~100 or so. I am going to start some test on these, am I missing any reason to why this would be a bad idea?

Benefits over paper wallet: No need to print key (could be held in printer cache)
Need a password to access the key (rather than just peel it)
Easy to stick on to cheap novelty physical coins
Easy to remove and reapply new one after sweeping
Can be placed in NFC blocker sleeve in storage area