Label me as NUTs, or a friken skeptic; but for some reason I find none of those Bcash wallets as quasi-trustworthy, except for Trezor and Ledger.    Yet Trezor proclaims that they have been compromised by some bad  actor, possibly, and no longer providing the Bcash wallets - until some future undetermined date, and Ledger hardware does not seem to be shipping until September 4  - or after that date (a long time in bitcoin landia)

https://www.bitcoincash.org/

I suppose that part of the reason that OP described ways (that I still find confusing) to keep private keys that are used from bitcoin separate from private keys used for the purpose of claiming Bcash.  So it seems like the essence is that even though we transfer merged  coins from an old (legacy) wallet to a newly created wallet, we are only using the private keys of the old wallet to claim the BCash and if some evil player wanted to go back to get our real bitcoin using the old private keys, they would find that wallet empty and our split bitcoin are thereafter residing in a newly created wallet with newly created private keys that have not been exposed to any of the Bcash wallet providers that allowed us to claim our Bcash - - maybe at the same time, we then need to move the Bcash again after claiming them?

I'm going through the scenarios, and I have not split my blockchain.info coins yet and I have thought that I could wait for the ledger nano s to ship - even though it might be too late by then.. I mean Bcash may then be worth a fraction of its current price - sub .05BTC I suspect.