It's a fair way from where you are, but I'd recommend training with Alan Cassidy at White Waltham.
If the S1 is your ultimate goal, then I'd recommend that the most direct transition will be by doing your whole tail-wheel conversion in the Pitts - the learning curve may seem very steep for the first couple of trips, but it will save you time & money vs. the alternative of flying a cub/decathlon/citabria/whatever to start with. The benefit of doing your Pitts conversion at WW is that if you can land a Pitts smoothly there, you won't have a problem anywhere else....