Don’t listen to anyone that claims it’s not possible to convert because of rim brake compatibility. If you don’t have enough reach with the current brakes installed… all you have to do is source new brakes!
I can’t say that about all bicycles though, some conversions will require some mechanical know-how and tinkering capabilities, or the drive to learn which is something I wish more people were open to try. It’s sad to hear that people will give up on the first set back like “my brake arms don’t reach.” Like holy crap have they not noticed that bike parts/components are 99% non-proprietary to the frame?