Here's an idea: just form a Junker "family" so to say. Not a political group, but rather a tight knit group looking out for it's own. A good way to start I would figure.
//sigh, guess i gotta use these stupid // things if i want to post here...
anyways, junkers operate in clans/gangs, as tinkerbell has stated before. If you want to make an un-official junker 'faction' (official factions cost too much anyways) just form a small 'gang' of junkers operating out of a specific area.
Just dont take bornholm, I've already claimed that for the Junker's Union, and I'd hate to have to start turf wars with other junkers =P
Trafalgar is a good place to start, or yanagi in sig13 - though sigma 13 is already heavily overpopulated by powertraders. You could also try the junker depot in new berlin (kreuzberg? I always have problems remembering that name).
Trafalgar would actually be awesome for you guys... there is very little activity in bretonia right now, and you could help liven things up there.