Whoops, prolly cause it was misspelled, try it as this link.
They can also be Emailed at Gyro@brooke-kensington.co.uk
As far as limited hand movement, I dunno...the closest done to that so far is a single hand control, combination throttle/brake - but given time, effort, and patience on behalf of your mechanic....I don't see it as impossible to kit out a moped trike in such a manner - it's worth a try, at least.
-Ree