Probably. A deck of cards {'echletHom vey} doesn't have to be in a box. It can just be sitting there on the table ready to be dealt. I think {vey} has more to do with the idea of multiple things included together as one associated whole, rather than the idea of things being in a box or container. If that's the case, {'InSong vey} would probably work fine for a set of flowers.

If the flowers are different varieties, {'InSong tlhoQ} might work (a "conglomeration" is a bunch of different kinds of things brought together). Other options for something like a bouquet might be {'InSongmey tay'} "flowers together", {'InSongmey nob} "flower gift", or even something more personalized like {'InSongmey qayIrta'bogh} "flowers that I have gathered for you" (using the prefix trick).

{Sor ghom} and {'InSong ghom} are probably fine until we hear otherwise from Maltz, though.