Some entities in RFP need to be excluded, but I couldn't bother to go through and figure out which, so I wrote something to exclude all the RFP prototypes:

mod_prefix = "rfp"
for _, prototype in pairs(data.raw["assembling-machine"]) do
i, j = string.find(prototype.name, mod_prefix)
if (i ~= nil) then
appmod.blacklist[prototype.name] = true
end
end

appmod.blacklist["angels-electric-boiler"] = true
(the angels boiler didn't get caught by the previous script, so I had to add it manually)
This can also be used for other large overhaul mods if you don't want to go in and list all the prototypes to exclude.

I'm still seeing incompatibility with Realistic Fusion Power with the latest version (2022.2.9). "Invalid pipe connections specification for offset {3.0, 2.0}. The offset must be outside of the entity bounding-box"