Hi and welcome here!
The belts are indeed available. I'm not sure Martin (aka Dillen here) has finalized his kit, just ask him: he's a dedicated (nay, more than that!) B&O fan and he is always kind and helpful. He has his kits re-manufactured specially, and they are not generic eBay items.
I have some spare parts (the lamps, the push-button), you can send me a PM.
My Beocord 2200 works very well and it is indeed worth repairing... I guess you saw the Hi-Fi World article!
Also some hints here.
Tim is nice and helpful, but he's easier to contact on his Beocentral website!