I think the Feathers are much bigger then your regular injectors but possibly they can be cut down. Someone with more knowledge will probably respond. And I know Feather doesn't make an ordinary injector blade because it will not any of their straights.
I've seen an internet post about a guy who scored the blade at the correct length, then snapped the blade using two pairs of pliers? Maybe he used metal shears or a dremel tool with a cutting wheel. Of course, wear safety goggles and gloves, and unless you deburr the blade, watch out for that one corner .
I never got great shaves with my injector anyway, so I didn't go down this DIY path.
In sum, it's possible. I recommend not trying it unless you're already a machinist.