Does it work? Yes, it works. That's not the issue. The issue is that having a scoop a full class size lower than your FSD results in roughly triple the time spent scooping fuel after a jump, especially a maximum range jump.
It takes approximately 90 seconds to fill a Diamondback Scouts tank from empty to full with a 3A scoop. On half a tank that's 45 seconds. I don't see an issue, but that's just me.
The Vulture would still do the FdL's job better than the FdL does for cheaper.
You appear to be implying the Vulture is better for bounty hunting and assassinations than a FDL. You're entitled to your opinion of course, but I think a mil-specced FDL running 5 shield boosters with 4 gimballed pulse lasers and a big cannon on the huge hardpoint is more impressive and does the job better than any Vulture build I can conceive of, because the FDL has the capacity for more shielding, higher speed, and better armaments. That's just my opinion.
If you had bothered to read the rest of that particular paragraph I did suggested a way to balance out SCBs so that combat wasn't quite as reliant upon them.
I did bother to read the paragraph, but I'd rather talk about what is actually in the game and how the things actually in the game work, not get sidetracked talking about how some hypothetical module that doesn't exist might or might not make things different. I mean anyone could just make up an imaginary module and do that right?