Can a 3-phase rectifier handle input from a 1-phase/2-phase source?
A three phase bridge rectifier can easily be configured as a single phase type. What you need to watch out for is: -


Voltage rating is sufficient
Current rating is sufficient
It's fast enough to efficiently handle whatever frequency you are
putting its way
It can deal with surges into charging the smoothing capacitor involved


As you haven't mentioned any of these you'll have to check your self.