Ninjabill,
Suggest that you forget all the hysteria regarding Tomahawk spinning and revisit the original question...
Last time I was at Sherburn - about a month ago for some aerobatic critique in my Pitts, I noticed a delightful CAP10B.
IIRC the hourly rental for that seemed very reasonable and I would suggest that you do at least some of your trg in that so that when it comes to skills-test time you could take your exam in the tailwheel aeroplane therby absolving you of the need to do an endorsement post PPL.
Stik