You need to put some feelers out, canvas some rural property owners just outside the metro area, explain who you are and what you do and see if they can accommodate you visiting 2 or 3 nights a month, setting up in a paddock, unobtrusively no skin off their nose....
I did this when I moved to Newcastle in 2007-8 (crap, bright, light polluted coastal skies) and found a lovely couple in Kurri Kurri, 40min west of Newcastle,
on 140 odd acres, who were quite ok with the whole idea of a (big friendly) amatuer astronomer coming out a few nights here and there to do photography

..in fact I found two and had to choose

Fortunately, the guys I went with were actually elderly professional photographers who ran their own photography workshops as a business
Admittedly it was a task to get out there with all my gear at first, but I ended up leaving the pedestal pier and NJP mount on site setup on three pavers set into the ground in a paddock...worked wonderfully for me for 2 years and I even managed to take several major award winning images from there in to the bargain, helping to make all the effort worthwhile
Good luck with what ever you decide to do Brent
Mike