Summary
Under Beyond, if you engineer a module which was created under the previous Engineer mechanics, it's converted ("Grand Fathered") to the highest level of the next Grade down. So re-Engineer a G4 module generated last year, it will give a top level G3 module.
The following suggestion simply offers this same approach for new modules, if you've previously Engineered that same sort of module before.
Suggestion
Clearly people are possibly not enjoying the prospect that with each and every new module they have to G1-->G5 it.
So I wonder if a compromise might be, if you've already got modules of the same size/type (onboard, on another ship, in storage - ie: You've engineered one before), which are a higher grade of engineered than the one you're currently engineering, then you have an option available to "Clone Existing".
If you take this option it then lists all the other ones you have (which are higher than your current one), showing their grades etc, and if you select one it then simply rolls your module at the highest grade at the grade below the one you're cloning (ie: The same as the "Grand Father" mechanic)? No side effects would not be considered etc.
So if you were engineering a new FSD, and you had other ones of the same size, you could choose to "Clone" a G5 one, and your new one would be rolled at highest G4 level. Thus meaning you've at least jumped up to a fairly high level with it. I'd suggest the "cost" for doing this would be the material cost of that roll level, so in this example it would cost the materials for a G4 roll.
In this way, at least if you've ever engineered a similar weapon/module before you can jump a long way up the grades on a new one.
Note: I'm sure there's there's more ifs/buts about this proposal, but it seems a possible compromise?
Note: If you consider at the moment, the wise thing to do in preparation for the new forced G1-->G5 mechanics, is to simply buy lots of modules and do a single G5 roll on them, and store them. Then come the new mechanics, you can level them up through G5 at your leisure. BUT, with the above mechanic, you can achieve exactly the same (all via the new mechancis), in a sensible way!
ADDITIONAL SUGGESTION
So you have a Grade 5 "Long Range" beam laser. And you want to try an "Efficient" beam laser. As the weapon in question is G5 you're allowed (once again using the same Grand Father mechanic) to change it to "Efficient" so it will become a top G4 "Efficient" beam laser now. You can then roll it up through G5.
So add the two suggestions above together - Imagine you have a G5 "Long Range" beam laser. And you want to keep it, but also create a new G5 "Efficient" Beam Laser. You would do the following:-
1) Clone your existing G5 "Long Range" beam laser onto a brand new beam laser (Grand Father mechanic) so it would become a top level G4.
2) You would do a single G5 roll on it. Because then...
3) You would convert it to "Efficient" (Grand Father mechanic) so it would become a top level G4 ("Efficient").
4) You would now roll it up through G5.
You now have your original Grade 5 "Long Range" beam laser and a new G5 "Efficient" beam laser.
And more importantly you have more time to play the game, and more will to live!
ps: Personally I'd suggest this "convert" option should use a version of the Grandfather Mechanic where it lowers it down to the lower grade of it's current grade. NOT, the highest level of the next lower grade. A subtle difference, making things a little slicker.