If you go for the idea of a dragon keeping them alive, I still say one of Danalin's dragons would be best.
Which ever is best.

I'm not as up on the Erebus history and lore. I'm sure those of you who
do know, will figure it out.
I don't want to harp on it like it's the only thing, but again, the whole "Our Empire goes back forever!" might give the Senshi a bit of flavor (even if they do end up Panderan!

) in that they might start off with something like a head start. Perhaps if there is a way to do it, 1 or 2 buildings could be made available early (even if the tech isn't there to fully exploit it). Say have some sort of special supply unit (or two) that shows up after the initial city is founded that allows a choice of certain buildings.
Another thought is, if possible, maybe they get a bit of an advanced start with a certain amount of set gold and can only improve their city (roads and the like) and add a building, but no techs. Maybe they also get a extra tech. However, Chinese & Tokugawa Shogunate civilization was also rather static. So maybe they need this because they may not be a very good tech developing Civ.
Plus, just a general question: Is there a way to have 'blind' research in Civ? I always thought that this was one of the best things in
Sid Meier's Alpha Centauri since it was a good way to handicap the human player without having to nerf them in relation to the AI players.
I'm not sure how the AI goes after techs (I'm sure the Civ traits are involved) but I liked the SMAC way of sort of determining on a sliding scale what sort of techs you'd were hoping for. Sort of like selecting extra priests in a city so you'll get a Great Prophet but not always (by %) getting one.
Anyway, beyond the concept, it would seem that blind research would allow (if activated as a feature) could allow cultures like the Senshi to have the special Civ power of non-blind research, similar to how the alien races in SMAC:AC could pick what to research. A powerful advantage is used properly.