I should have reported back that I am online. A friend generously lent me his old MBP11,3 from 2014 on which, in 2023, I had installed OCLP 0.6.9 and Ventura, with exhortations that he update often (he ignored that, but enabled auto update). He lent me the MBP because I said I would use an external SSD for my stuff, and not touch the internal SSD. As soon as I received it, I downloaded OCLP 2.4.0 meaning to remove 0.6.9 later. But autoupdates don't wait for anyone, and the MBP updated to Sequoia on the main SSD. It is to the credit of OCLP 0.6.9 that not only the installation go well, it restarted albeit without WiFi and stuff. As I had OCLP 2.4.0, I updated to that, and did a root patch. Dead easy. No hiccups whatsoever. Now the laptop was running Sequoia, it was relatively easy to create a USB installer for the external SSD and just do a 'routine' install. OCLP spoils one - no extraordinary mods, nothing, just works. And since the M1-MBA was gone, I didn't need to spoof anything. Laptop is working like a champ. Thanks to you all.