Thanks.

LoyceV Yes I am able to get the private keys dumped. Got private key dump from two addresses now.
(A bit paranoid as to how to temporary store this private key. Once dumped on screen I probably should consider things compromised and work hard to secure this promptly.)

My new MacBook Air only has 256 GB disk so I have ordered a new WD SSD 1TB hard disk that I will pick up later today. So I might do the entire new download on that disk, this will take a few days again to do this.

It seems maybe trying something with the private keys might be a better option.
How do we suggest to go about it to restore with the private key.

I am familiar with the Exodus app on MacBook desktop, seems there is a way there to import private key there.

My end goal is to move all holdings of Bitcoin to my Ledger Nano S hardware wallet.
I assume I will have to make at least one send transaction for this.
(As I have been working on these 3-10+ different wallet.dat files now for some 1-2-3 weeks using various different hardware (old disks, disk readers, 3 Macs) I probably should consider all of that compromised and get all off to hardware wallet.)