I think I'll look into the tile saw/blade route, thanks for the suggestions!
The club membership idea would be a good one too, but I don't think there's public groups like that in my area, and it's not something my parents would be keen on anyway.
Edit-
Probably will go with this saw https://www.amazon.com/gp/product/B003HIWR08/ref=ox_sc_act_title_1?smid=ATVPDKIKX0DER&psc=1
And these blades
(why is that second URL so long, lol)
I use this tile saw - https://www.amazon.com/SKIL-3540-02-7-Inch-Wet-Tile/dp/B003HIWR08/ref=sr_1_5?keywords=tile+saw&qid=1661966949&sr=8-5 - for breaking down large tube quickly. I will warn you, it makes a mess, especially with larger thicker tubes like 44x4... but I've broken down 66x5 on it without issue. I have gone up to 80x3 with it but that was unnerving and I can't recommend it to anyone as even I won't do that again. I use an apron (because the saw blasts wet glass dust back in my direction), rubber cleaning gloves, safety glasses/goggles, and a respirator to avoid getting particulates in my mouth and lungs. With the saw above, I can only cut about halfway through large tube before it hits the guard, after which, I have to rotating the tube while in the blade to finish the cut. The first few are nerve-wracking because you can't help but feel like the damn thing is going to pop and turn into a billion shattered shards... but it doesn't and it works well.
The 12x2 is cake. Score a line, rub some water around the circumference where the line is scored and crack the tube with your hands - make sure your thumbs are opposite to where you scored your line. There are tons of youtube videos on this process that I recommend you watch before attempting yourself.
Good luck!