Forcing Yuezhi to invade anyway + adding units

[Connacht]

I wanted to ask two things:

- the first one is that I know that the Yuezhi are active only if you control Chighu with specific factions (and the most western ones still exists), but with the Seleucids I don't want to do a long travel in the NE corner of the map, through steppes and Saka armies, only for seeing the Yuezhi active. So I thought to modify the EBBS in order to force the Yuezhi to start an invasion even if you don't control Chighu.
Unfortunately I'm not expert in scripting and I fear that if I try to modify something I would do nothing or, worse, see undesiderable effects in game or even CTDs.
So I'm here, asking for some advices. What should I modify precisely? Thanks. ;)

- the second one is related to units. I wanted to add some minor units available to other factions, but they need an image for unit stacks (otherwise it will be a black vanilla Roman peasant as you know). I don't know precisely how to implement them, maybe I can try to modify some files but also here I think that I may do something wrong altering files (and I also don't want to load, quit and reload many times EB if I see that modifies don't work and I need to exit and continue to modify).
I also think that I should modify the building file, adding those units to the rooster of recruitable ones, right?

[burn_again]

The Yuezhi will appear no matter who controls Chighu. They will just keep standing around the city. Being active just means that they will be a threat if you control Chighu, on VH they might even attack the city.
I don't think you can do much to make them more active via the script, you'll have to move an army there to fight them or you could use "move_character" to move them into your territory.

[bovi]

You need to do loads of stuff to get a unit to work for other factions that they are set up for, including changes in EDU, EDB, DMB. Possibly others. Any mistake you make will likely not give any warning but will rather crash the game at a later point. If you really want to do this, you need to research the dependencies.

[Connacht]

You need to do loads of stuff to get a unit to work for other factions that they are set up for, including changes in EDU, EDB, DMB. Possibly others. Any mistake you make will likely not give any warning but will rather crash the game at a later point. If you really want to do this, you need to research the dependencies.

So, I suppose I should stay quiet with my hands, otherwise I could risk to muddle everything and get frequent CTDs.
However, I wanted to recruit units like Armenian light spearmen or Arabian archer-spearmen with other Mid-East factions (i.e. Pontus or Seleucians) and not only with respectively Hayasdan and Sabaeans.

[Tellos Athenaios]

At least as far as the Seleukid case goes:
In the case of the Armenians: should be farily easy to mod in.
In case of the Sabaeans... not that easily done. You see the Sabeans are on their own texture and that's not the merc one; but the model is also used for the Eranshar archer guys (who occupy both romans_julii and merc slots)

Though I dunno, perhaps the Slave faction has it's own model, you can check that with the EDU. If so you can try to award the romans_julii a slot on the slave model also. But only if the slave's don't happen to recruit the merc Eranshar guys. And I would count on that to spoil your fun.