While everyone is holding their breath: the possibility of adapting an existing roller rocker isn't great, but it might be there.
1. the O/A length still has to match the stem-to-pushrod distance
2. all aftermarket rockers will have bigger shafts, so either make one or bush them down to .792" for the Chevy shaft
3. the exhausts are easy, since the Chevy stem angle is very close to some existing rockers at 14°
4. the intakes will be tough, since it angles backwards by 5° - I can't find anything useful that does this. A possible cure is to just use a longer adjuster (more exposed body); this isn't suitable for X-high springs, though