Two days work? The risk that your repair will not work, or will only last until you drop the keyboard? It’s cheaper to buy a new keyboard. That said, thanks for the description.

Is it possible to only Partially remove that metal backing plate, in order to access the damaged area of the keyboard? My keyboard has a dead Tab key.

A workaround is to use Karabiner-Elements to remap the ‘Approximately equal to’ key, between the left Shift and Z keys to act as Tab. Not perfect, since one rarely-used key is now unavailable, but it took minutes to find the free software, install it and remap the key, over a year ago, and I’ve only really needed that key once in that time. [Simply quitted and then reloaded Karabiner for that.]

Alternative ‘spare’ keys, depending upon your keyboard use, include §, ], [, or maybe even one of the Command and Alt keys.

The biggest disadvantage is that, when using a different keyboard, the wrong key for Tab keeps being used!