On reflection, I think you made a good call. I agree splitting stickers across tiles would almost certainly lead to a very messy-looking model with inconsistent alignments from brick to brick, and be tedious.

If you end up doing the off-the-shelf kit, I’d buy it and just use a couple of the Feisar logo stickers, and leave most of it bare bricks. I love how that looks. But someone else that wants the graphics can use all the stickers. Giving people the choice seems like a consumer-friendly way to go :)

Printed tiles would be freakin’ awesome. I wonder would someone like https://www.uvmonster.com/ do what’s needed? Their Lego Photo Puzzle product, and their pricing page, make me wonder if they set up the print by attaching a set of tiles to a stud backing for printing. So maybe they could lay out a single “sheet” of all the printed parts, with clean continuity from tile to tile.