Not going down the Invisiframe route as seems crazy covering the entire bike in it.
Want to do top of top tube, down tube, chain and seat stays, BB area, head tube and back of seat tube
Exactly what else does an Invisiframe kit cover over and above what you want, because what you want sounds very much like an Invisiframe kit?
Either you buy some vinyl rolls and spend a lot of time and trouble measuring and cutting it as you did previously, which was, in your words, a PITA and the results of which you were not very satisfied with, or you buy an Invisframe kit if they make one for your frame, accepting that care is still needed when applying to get a good result.
Whether you buy rolls of tape or an Invisiframe kit, matt finishes vary and so your frame and the vinyl are unlikely to be a perfect match, if that matters to you.