In my LBA frenzy last year, I bought about
60 M42 and M39 lenses on eBay, with a mean cost of about US$20 each, including shipping. A crisp Asahi Takumar 55/1.8 cost under US$7.50. Yes, these lenses are affordable.
Setting up your Arctic darkroom will be fun fun fun.
Field-processing B&W film isn't be too difficult; hauling around chemical trays, an enlarger, and a lightproof tent will be more of a challenge, especially keeping your chemistry at tolerable temperatures. Long ago I used a Stabilization Processor (from Spiratone) for fast, trayless, B&W printmaking, but the images deteriorate before long. I also tried DIY color processing and printing, but the temperature requirements were not feasible for field work. In a powered, heated igloo, you
might have a chance...