I also found it an interesting idea to get the macedonian or hellenic empire for the blood of alexander but i don't know if you want to expand one mod that much as to start entirely new nations and religions as it will probably always have a dozen ways to keep expanding it.

another cool idea might be blood lines of famous roman emperors and generals

@tom.shouten

Yea, I might, there's a couple of mods that do that, but over time I might make my mod the go-to mod for everything roman. Custom buildings, events, titles, etc.

you asked for ideas concerning ck2?
maybe adding the western roman empire as a formable empire
and have the western empire and byzantine empire get the imperial conquest cb for their respective side of the roman empire