So, in review: tech pass in fundies, looking to eventually do 100m dives in exploration environments?
Why do "Extended Range Limited Trimix" and then more GUE courses rather than go directly to Tech 1? You'll get down to 51m, 21/35, 18/45, 50% or 100% with 30min of deco.
As for the RB portion. GUE has a stance of adding it into your diving after learning OC skills with multiple bottles (post Tech 2). Once you have your RB, you're good to go (gradually, no sense in doing a 400ft RB dive right after the course). No MOD 1, MOD 2, MOD 3, etc.
As for your future goal of 100m exploration. Do you have people or group of people in mind to do this with? What are their certifications?
It's a lot easier to do a dive like that if everyone is on the same page from the same background ... is it a GUE dive, a TDI dive, a DIR/DIKR/DIRW dive? (ex: I have no problems doing a GUE Tech 1 dive with any GUE Tech 1 diver from anywhere in the world after just meeting on the boat before splashing .... not so much with anyone from outside that training until after a few dives, and I would hope for the same reaction if I was to join in on someone else's dive - other training).
RB aren't cheap (GUE JJ is roughly 15-18K all said and done), and getting to those depths takes a while (either through MODs or GUE). Two different approaches......
I'm in a similar boat in regards to location .... I'm 12hrs away from where I do my tech diving and try to get out there for "long weekends" every month or so (averages out to be every 4 weeks), and when diving locally, it's shallow fresh water diving. For me, I don't have a giant pile of funds, but do have enough to keep my happy with a Tech 1 level with fun toys (cameras, scooters, and warm water travel every year). Maybe in upcoming years I may go on to Tech 2, but that's only if there are more dives that I really want to do, and can keep up the commitment of Tech 2 dives .... or I move over some mountain ranges closer to a coast.....
_R