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The sealed units may be better to reduce shock chances

Ed the switch needs to be rated to the motor size also
The switch I linked is a direct inline controller for 240v 1500w
My inderstanding from talking the the leckys is that the 0-10v switches...

AC 220V 1500W Power 2 Wired Connect Variable Speed Motor Controller Switch White | eBay

don't think the link was working
so try this 1
cheers
D

You could try something like this Mate, me leaky brother at work reckons this would work as a variable speed for a 1 phase motor
As mentioned not the best but definately doable
Hope this link...