Oh that is so cool! I would love to get one of those for Jack and Sunny!
I think you'd get away with that in the US and Canada, but I'd be lynched by where I live if I took my cat out in a pushchair! It's something I think British people in particular where I live, bloody chav city, commoners they'd beat me up probably.
I hope he enjoys his rides and can't wait to see pictures!! Cue lots of exited anticipation