Everything is possible with enough money...
Real answer is not for less than you can pick up a 212 for.
If you're keen you have 2 options:
- Get a Civil Type Certificate for the UH-1N
- Approach Bell to inspect the aircraft against the B212 type certificate and issue a new data plate.
The other issue is many of the parts on the UH-1N have not been maintained to civil maintenance data, and hence you may be up for all new engines and dynamics.
Have a look at CASA AWB 01-8.
Not sure what the market is for 212s any more, most have been replaced with 412s (same power, less vibration and can't hear them coming from over the horizon).