Personally I'd go for a bash plate as it it offers slightly better protection and also if you land on your bash plate then it'll be easier to keep your balance. I think a 74 kings will fit on your cranks but don't take my word for it I may be wrong.
Just looking through trials-uk and i spotted these freewheels. They've been put under the recommended section but if people have any reviews of them please give me your thoughts. http://www.trials-uk.co.uk/product.aspx?productid=2130
I never get moved on by the police, they don't seem to care any more. It's probably because they've realised we just go back to the same spot 5 mins later.