Acer Travelmate P2 - recovery media and installation of Win7

Hello; I am new to this community, but not new to online technical communities.

Should I be able to install Win7 from my legitimate original Win7 CD onto the Acer Travelmate P2?
If so, is this the place to get help?

I have been using and building Win operating system computers since the early 1990s.

I have a large diary (about 30MB DOCument with screenshots, photos etc) of my efforts to date.

I have a 511KB SystemSummary.txt, part of which I show immediately below.

System Model TravelMate P2510-G2-M

System Type x64-based PC

BIOS Version/Date Insyde Corp. V2.01,3/12/2018

BIOS Mode UEFI

BaseBoard Manufacturer KBL

BaseBoard Product Aquila_KL

BaseBoard Version V2.01

On June 21st 2020 I purchased an Acer Travelmate P2 laptop and have been struggling with it ever since. It was pre-loaded (by the dealer) with Win10-2004 and I am still trying to make a bootable backup of the hard drive before tweaking Windows 10-2004.

My primary goal was to create a system image on a 300GB USB HDD, a bootable recovery key on a 64GB “DataTraveler G4”, and then lock both media away in my fire-resistant safe. My secondary goal was to institute a weekly or monthly system image [incremental?] backup to a 1TB USB HDD so that I could recover my tweaked system when things got way beyond the old “System Restore” mechanism from Control Panel.

I have not yet started using Win10 except to battle the UEFI business, and now I learn, perhaps the GPT business. I long for the good old days of BIOS and the boot sequence.

I have been unable to work out:-

(1) How to create a Win10 bootable recovery system on the 64GB memory key

(2) How to drop back into Legacy Mode (which I think is the BIOS I have been used to for thirty years)

(3) How to demonstrate a successful recovery - by deleting a simple text data file from C:, then rebooting from the memory key and rebuilding from the 300GBUSB HDD system image.

I am saddened that there appears to be no simple Win10/Acer/UEFI one-click technique for expert and novice alike to make a working copy of the hard drive before changing anything on a new system. The only boot option seems to be the “Toshiba” hard drive.

I have, in a moment of fatigue, managed to do a Factory Reset which right now, sadly, seems like a step forward!

I am at the point where I would happily reinstall my original Win7 CD operating system and continue to live my life, if only I could get the Acer to boot from that Win7 CD on the external USB CD drive. I do not need Win10 for my work. I do not need USB3.0 ports for my work. I do not need GB of RAM for my work. I need Office2003-VBA (yes!) and a keyboard with a Ctrl-Break key to interrupt VBA program loops.