That is just the gateway drug to bootstrapping.

Check out https://github.com/fosslinux/live-bootstrap

if you want the real hard stuff.

They already did: https://www.commanderx16.com/

you just probably want something better.

and that is the problem building higher performance requires more advanced lithography and that is expensive and until recently was not even an option for a hobbyist (without taking a mortgage on their house).

Given current stagnation, you need only wait about 10 years for that viable option.

rxvt-unicode with tabbedex.

I refuse to use a terminal emulator that needs more than 100MB of RAM to display 80x24 green text on a black display

Well the minimal bars for electronics is:

0 - The repair manual exists and is readily available with full schematics of the item in question.

1 - Replacement parts are available for purchase.

2 - Compatible replacement parts are made by 2 or more 3rd party companies

3 - Designs for replacement parts are available

4 - Local maker space is able to make the needed replacement parts.

If you can’t get level 0, you probably shouldn’t buy it if you expect to keep it working for life.