Okay, so soon after I last posted, I started toying around with my old AVR mkII ISP programmer to see if I could get it to work again. It worked at some point in the past, but I’ve reformatted my laptop since then.
I will spare all the details suffice it to say that I spent about 4 hours trying to get the development environment set up, and for like 8 seconds, everything was swell-ish.