No, its not practical. There are dozens of reasons I could go into, but I'll give you what I consider the deal breaker.
The biggest issue is the need for a gearbox/transmission. To generate the amount of power you need (pretty much maximum power for these engines), you will need to run them at approaching the maximum rpm. For a sport bike engine, this can be anywhere from 10,000rpm, to 15,000 rpm. A propeller only runs about 1,500rpm-2,500rpm. That means you're going to need a gearbox to take care of the rpm difference. It will get even more complicated if you need to modify the engine to idle at an appropriate prop speed.
While it probably can be done by a clever and handy builder, I consider it not worth the money. You can get a special built aircraft engine for not much more money than a 1000cc sport bike engine.