Spunding vlaves are a bit different to what you want I believe. Spunding is fermentation under pressure, whereas for dispensing cask conditioned ales you want an aspirator. Though I'm no cask conditioned expert. Either way, you're looking towards England to find this kind of kit.
'Vlad the Pale Aler' was looking into this recently so might be worth pinging him a pm.
Unless I've got my dates mixed up, next WCB meeting is next Monday at the Community centre in Rivervale. 19:30 start, will be a competition round for the lagers. But feel free to bring along any kind of beer and we'll try and give you some helpful feedback.
'Randyrob' is kinda da man for the WCB at the moment, so you can ping him for more specifics.