Hello, I plan to split my BCH and other forks soon.

I know to send my BTC from the addresses with forked coins on them before importing that private key into any other apps.

My question is, do I have to send them to another wallet or just to another address?

Can I SAFELY send them to, and keep them in, a new address in the same Electrum wallet after exposing several private keys of other addresses in that HD wallet?

The only risk I could see is if it is possible for a malicious splitting app to derive my master private key or my list of other HD addresses by reverse engineering the several private keys I import from the same HD wallet (even though they no longer have BTC on them.

Thanks so much!