I wouldn't use the word "most". There are a ton of half-DE shavette's that don't take injector blades, the ones that have blade corner stoppers, like the Universal, for example, can't take injector blades.@albsat , I think most multi-piece half-DE barber razors will work with Injector blades, but Sanguine and Personna each make one specifically for Injector blades and Personna’s mini hair shaper blade (an Injector blade by another name). Personna has the “Monsieur Charles” and Sanguine has whatever the crap this is called.
I remember one half-DE shavette that can take both injector and Feather AC, the Antiga Barbearia de Bairro, but it's a PITA to load, even half-DE blades (at least mine is, I don't know if anything changed in the production/design of the razor in the last few years).
Another shavette that can take, officially, injector blades is the Tedalus Essence.