That wasnt the one on eBay by any chance...? mumble mumble... was looking at that myself....

Those motors would probably do the job, although I've not run the calculations. They are 10mH inductance... above 300rpm they are struggling although it is highly driver dependent. I know because I have 4 of them... so we'll need to run the calcs and see... you will need to run them bipolar parallel at 36v or more to get useful work out of them.