Couldn't you just make a single transaction with all of your BTC you currently hold (provided you've held it in the same wallet for recent history, when all the

Couldn't you just make a single transaction with all of your BTC you currently hold (provided you've held it in the same wallet for recent history, when all these forks have occurred), then cash out all of your forks/airdrops using the old secret key? You still run a small risk that a shady fork/airdrop could try to use your secret key to transfer other forks/airdrops, but you would avoid the risk to your BTC holdings.