My friend, you have no idea how right you are.
It was a day job to install, and half a day to remove according to my grandfather, which is why the 3 point hitch was such an amazing development when it came out. When they mounted these pieces of equipment; whether it be undermount plows, cultivators, hillers, or belly mowers...as much was done as could be before switching out the implements.
I would not feel bad about chopping the implement up though. Unless you have a tractor it can fit on, using scrap steel to build other implements is going to benefit you more than trying to find an old tractor restorer who wants an undermount cultivator. I am nostalgic as the next person...probably more so...but repurposing old implements to live on with implements that are more practical has its place too. (I do it all the time)