I think @Gareth0123 advise is the way if you want something to be perfect and repeatable.
I JD Squared 32 is the way forward, but I think for 50mm you are going to need a hydraulic conversion. They sell like hot cakes new and you very rarely see a used on for sale so even if you bought one and sold it after you wouldn't lose too much.
I have a Rothenberger Robull, it a proper quality bit of kit and it does nice bends as long as the push piece fits nice but I want a Model 32.
A 32 with hydraulic will do 2" tube with 1/4" wall thickness which is some serious metalwork