personally: I wouldn’t worry so much. All I would do is get a lump of beeswax and rub it onto the frames as if they were cheesegraters. When you do that just a little wax rubbs off on the edges of the plastic. That is all that is required- and in point of fact- even that is not required. On our first flow hive we simply put the frames in without doing a thing and the bees started filling them immediately.
On another hive of mine I rubbed wax on and the bees ignored them for several months. I think the biggest factor is simply if the bees have nectar to store or not. If they don’t no amount of coaxing will help- and if they do they will set to laying it in.
the problem with putting honey on the frames is that it can attract ants and other pests.
A hive can seem ready for the super but not be- there may be a lot of bees but not much nectar around to spare… also when they are building up they eat a lot of nectar as they go - so there can be a period where it appears only to disappear. The good news is: when they are ready the bees do fill the frames!