You cant force the agent to take it on as PM. As soon as the PM contract ends they will hand it back to you.
If it is such a bad area that 12 agents will not manage it then I think you need to seriously consider if this is an area you want to buy into.
What he said.
Warning bells should definately be ringing - the last thing you want is a bad tenant and if 12 PMs aren't prepared to touch it I would hazard a guess it is a pretty high risk. What is it about "the numbers" that makes you consider buying it in the first place? And do those numbers factor in a bad tenant who doesn't pay the rent and won't leave + associated costs with going to court etc etc. Doesn't sound like a good deal to me so far.