Simple solution to the keyboard issue is to buy a UK one... (have it shipped from amazon or somewhere that delivers abroad, or get it shipped to a uk mate and have them fedex it to you)
As for power supplies, no issue there, modern power supplies can take inputs of just about anything, and even if the one you end up with can't handle uk power, a new uk one only costs about 15 quid, and the output from them all is standardised.