you aren't being 'forced' to exploit anything.
you chose not to do this unlock, and apparently the guardian unlocks as well... I'm assuming there are other areas of the game you've ignored... for 5 years.
Get a new, unengineered DBX. D-Rate everything except the FSD and you've got about 150 jumps or so. You can use those jumps to explore the galaxy you've been ignoring for 5 years... or you can just head in a straight line for about 2 hours. Then you've got a choice to make: Delete the DBX, or jump back. If you've you've unlocked the FSD engineering, it's an even shorter trip.
Entirely your choice.
You could take the opportunity to jump to Colonia and unlock the engineers over there, passing the Guardian sites on the way... completing multiple girinds in 1 shot.
You've got options. Lots and lots of options.
Okay, let's clear a few things up.
I have not ignored anything in this game. I've actually played 3 careers all the way to the end stage. So, when I say these activities are grindy and unfun I know what I'm talking about.
I have no problem spending time & effort to advance in the game, but I resent being forced into unfun, repetitive game loops for dozens of hours just to improve my ships.
This problem is compounded by the fact that MY preferred game loop involves building & engineering ships. That means gathering raw materials is a CONSTANT source of irritation.
I'm really just trying to offer suggestions for improving the game here.