Thanks again LoyceV.

If I can buy dust for BCH and eCash, transfer them away to new wallets inc dust, then would BCH and eCash be safe? I.e. if I then moved BSV without dust, what would the risk be?

Yes, values going up has prompted me!

I'm looking at Changelly or similar to swap some of the low cap coins. Selling options particularly restricted to me in the UK these days. Will do in small chunks of course.

I did read your send-to-pubkey post, that makes sense. If I have the signed transaction from my offline BCH wallet, can I then broadcast it from https://blockchair.com/broadcast (selecting BCH network) as I did with the BTC process?

I'll set up and sync https://bitcoincashnode.org/en/download.html on a new Ubuntu installation, checking sigs of course. Guess that'll take a while.