As has been said, I don't know of any camera, M42 or otherwise, that can take a lens not made for that camera, to use open aperture metering. There has to be a coupling between the lens and camera, that the camera's light metering system understands. Your 55mm f/1.2 wasn't designed with that in mind, but rather for stop-down aperture metering.
However, many cameras allow the use of that lens. I think any M42 camera would be able to use it in stop-down mode. There are even cameras that have the AE feature that will respond to stop-down metering. The Fujica ST 801 and 901 will both work that way, but of course the 801 has no AE. The 901 does and it works well. I have used a lot of non-AE coupled M42 lenses on my ST 901, despite what some have said above. As someone mentioned, you just have to close the DOF down by pushing it in, then turn it to lock it. Open the aperture, focus, and close down. The camera will automatically and steplessly choose the correct speed.
Somebody mentioned the Yashica AX. It was AE, but in this case would require stop-down metering. In fact, for some reason I think I read all lenses did, since prior to the AX, Yashica had no AE, and all their prior lenses would have had to be used in that mode.
Pentax had a AE M42 camera just prior to going to the bayonet. I don't remember the model name, but it may have been Pentax EM, or am I thinking of the first auto Nikon?
If AE isn't necessary to you, given that the Fuji 901 is I think, the only body to do AE so effortlessly with non-AE lenses, you should not worry about using any of many M42 cameras of the 60s and 70s, that use stop-down metering.
I have had and used a Yashica TL Super and Electro X. If you get one working properly you won't be disappointed. But the TL Supers working properly are hard to find considering their age. Interestingly, the Electro X, which is younger if not by much, seems to have held up better. I have and have used a Fujica ST 801. Fine camera, but I don't think most people use the 1/2000 second shutter. I certainly don't. Some of the newer bayonet cameras will use M42 lenses with an adapter, but again, metering, if possible, will have to be stop-down. I have used a Contax 139Q that way. I think my Contax 167mt works that way too, but I'm not sure since I've never tried to use any of my M42 lenses on it.
Good luck with your lens. I have often wanted one but never wanted to pay the price for one. It has been a classic for a long time. But f/1.4 has served me quite well and I don't think I need f/1.2. The 50mm f/1.4 with the in-camera shutter display has allowed me to get most photos I wanted in low light.
I would consider fixing the aperture pin, whether you can do it yourself (but only if you have some experience), or send it out. As I said, it is a classic lens and deserves to live on for a long time.