While I had a great time on the one at Park Asterix and am a big lover of family water rides...
I can't see how sending this to Thorpe makes good sense.
They've proven with enormous success that they can survive almost entirely on the adult audience, so the urgency to cater for the "family" is no longer there.
There is another park within the chain, within a few miles that is just begging for an attraction like this.
Even Alton would better suit.
Even after that, I'd have said sell it before suggesting Thorpe!
While it'll provide hilarity and amusement to the adult audience to some degree, I fear it'll come mostly from them trying to make their own amusement.
I've seen the French jumping out of L'oxygenarium, and I'm fairly certainly the UK crew will be eager to give such hijinx a go too =)
Oh, and the designer in me is just screaming at the staging of the ride.
It's clearly designed on a wedge shape, where the only angle considered to impress the audience is the front. Like most fair attractions.
Stick it in a place where you can see it from all sides, and from most angles its going to look uuuuuuuuuuggggly