This is quite an ambitious project
I totally agree with your thoughts in relation to the TFC packaging.
Not being a G1 collector, but recently acquiring TFC Hound & Blitzwing (due to a desire to revisit childhood nostalgia), I have developed an appreciation for the packaging they have used in the TFC line.
It is quite an exquisite packaging design with excellent box art and has even made me want to collect the entire series (even though I have no interest in any of the other G1 figures).
If similar type boxes were to be produced for Classicverse toys, may I suggest that they be made big enough to house the original packaging?
This may be an issue seeing as most boxed items across the various 'Classics' series are differing in size (whereas carded ones are roughly the same), but it would be nice to be able to retain the original packaging.
Someone like myself that (partially) collects MISB/MOSC items cannot bear the thought of ripping open the original packaging (even if it was to put inside an 'improved' or uniform box design).
I don't support third party items (like add-on bits & pieces or complete figures), however if it was an outer packaging designed to slip onto an original box/carded item (for the sake of uniformity across the 'Classicverse' releases), then it would be something I would seriously consider.
On a side note, as the lines have become increasingly blurred between the different releases, what constitutes 'Classicverse' and who decides what is or isn't included in it?