"Adventures" in NVRAM reset land, and need to have a safe boot backup

Given: MacBook Pro 11,4 (mid 2015 retina 15") & OCLP 2.4.0 (to start with)

I can only imagine what some of you may think when I publicly recognize that I had a brain fart when I desperately needed an USB drive connected, and the port no longer recognized it => old habits die hard, so I Option+Command+P+R-ed out of the system, and there went NVRAM. And - of course - with it OCLP EFI configs. And there went hours of my time, trying to restore the entries (running 2.4.0 at the time, not succeeding first to access the EFI and have it recognized, then trying to see if an upgrade to 2.4.1 may re-create the entries (not), then manually creating the BOOT and cp-ing and renaming the efx required file, etc., etc., etc.), then getting messages that I have 2.4.1 installed but still running 2.4.0, then ... on, and on.

I have eventually gotten all set and running, as it should, so I am now post-disaster "wiser", and asking here: what is the best method to create an USB boot drive, with all that's required to recover my system, should anything bad happen again - e.g. the OS version I am running now + the OCLP config (to the best extent possible) + all else necessary?

NOTE: I do not need/want a whole system backup. My data is already safe outside the system. This would be a "knee-jerk recovery", to get back up a system, in case of another failed step like the above described one.