Obviously it will work but how well I can't tell you. You could presumably base something on Zubblys watts per volume of magnet formula.
I would expect a 6 pole machine to have better proportioned slots for conversion than a 2 pole so that may be in your favour.
Inherently the rating of these motor conversions is related to the operating speed in relation to the original design speed so starting with a low speed machine should give you a bit of advantage. You give no idea of the rated power out, that should give you a fair idea. Things under 2hp don't produce much and low speed machines are big for their rating so you may be looking at a modest power machine for that size of core.
All motor conversions are pushed incredibly hard to get a decent power out, it comes at a price in terms of efficiency and you tend to end up with rather high prop speeds.
You do tend to get better prop performance from running well up on the speed curve and this somewhat offsets the low electrical efficiency that you get from squeezing lots of power from something rather small.
Unfortunately you will have to do the conversion before you get much idea of what you can expect from it unless someone here has experience of a machine of this type.
If you are looking at 48v you may do quite well.If you want 12v then without rewinding you will have a mess of parallel connected pole groups as the series groups will have too much resistance.
Flux