I am confused. I thought that most (non-super) nova were a binary pair, one a dwarf or such. It draws off gas from the other and when enough collects, pow. A cycle that can repeat several times. A supernova is (usually?) a large star that is losing it’s more efficient fuels, can’t hold off the gravity pressure, implodes a bit, and kerpow. A one shot deal.
When two (regular) stars get near enough, the gasses of both would get pulled towards each other. (Roche’s limit and all.) I don’t see a nova happening at that point. I think you would generally see some breakup into blobs, which would then coallesce into 1 or more objects, the largest being star(s) and the smaller not. Even if it you end up with 1 star, if there was plenty of hydrogen in the original stars, there shouldn’t be a supernova for a long, long, time.