You're right in your main point that it's a massive pain, but let's talk BTC/BCC. Disclosure: I'm a novice. BCC has "replay protection" meaning it uses a diff

You're right in your main point that it's a massive pain, but let's talk BTC/BCC. Disclosure: I'm a novice. BCC has "replay protection" meaning it uses a different transaction signing mechanism than BTC so that your transactions on one network cannot be "replay"ed on the other network by a malicious actor. I think people obsessing over keeping your coins in wallets with differing keys is mostly just paranoia. e.g. they want to eliminate threat vectors from their BCC wallet trying to steal BTC or that replay-protection may have bugs discovered in the future (unlikely AFAIK). The clean computer thing is also paranoia. Some folks keep an updated Linux LiveUSB just for their transactions. You can decide for yourself it it's worth the risk. As far as finding a new wallet, a quick Googling makes it seem that MultiBit uses BIP32 to generate keys. This is an open-source keyword based key generator that's used by various wallets, so you have a lot of options for multi-coin wallets, I'm a fan of coinomi on mobile. If you recreate your wallet using keywords there, it will show your BTC and BCC side by side.