Seems to me like,if you can pull it together for anything close to reasonable cost,it'd definitely have a good market. If you decide to offer a kit,I'd suggest making it an "as needed" operation,that way you won't need to keep a lot of parts stored,just build the kit after it's ordered. I have-let's see-two 2 Ton trucks that could benefit from that kit,the '57 with six lugs and the '54 with 5/10 lugs;the '54 2 ton especially,since it's geared for over 100 mph top end.
BTW-my "passive" research shows it'd cost me about 2 grand to do the "nice" disc conversion on my '57 half ton,and the whole truck is only worth about five hundred,so that
ain't gonna happen.