Bumping this thread as it seems a fun topic. I have a heap of blades and if I found a blade that didn't work, I just kept buying razors to find a home for that blade
Exceptions were dorco, derby, never found a home for them. There were blades that were OK but I ran out of them and didn't buy any more due to cost (better bargains elsewhere that worked as good). Examples gillettes, kai, wilkinson, polsilver.
I have some blades I would get rid of if I lost the razor that made the blade work, eg crystal/Israeli's only work with a NEW for me. Red personnas worked well only in some other vintage gillettes - I think slim and flare tips.
Astra were the 'almost work in anything else' I regularly used, but not optimum for those mentioned and some others.
I've already sold my flare tips so I would sell my red personnas if I didn't have a slim. I would sell my Israelis if I didn't have a NEW or open comb of some type. Without those razors I would just stick to feathers in a tech/feather portable, and GEM in a SE of course.