I'm definitely in favor of a system for recycling surplus blueprints.
For example, with a quantity of almost 700 or more for a fully upgraded weapon (even if it's just a regular weapon), I wonder how ill-considered or low-priority this system was conceived.
It's also not the first time I've read in the forum "A system is being worked on, but it's not currently a priority," but no more precise information on the extent to which player suggestions are actually being taken into account.
Long story short: If this problem has existed since the beginning of the game, about four years ago if I'm correct, then I wonder if anything like this has even been considered.
What such a recycling system might look like is certainly not an easy task, but I think, depending on the rarity level, a certain amount of credits, A-Coins, or perhaps something like tokens that can be exchanged for other blueprints would be a satisfactory option for players.