I think that there would be a solo rental market for a well presented aerobatic tailwheel trainer/tourer in the South East. You would need to have one or two very good tailwheel/aeros instructors to vet potential renters (I can think of a couple of names if you are interested). I would suggest that careful vetting would be a better option than, eg minimum 100 tailwheel hours, as aptitude and attitude matter more than hours in any event. Having potential renters converted to tailwheel by your instructors ought to be a reasonable guarantee that their tailwheel tick has been done properly. Finding a suitable base with hangarage would not be easy, but there are some spaces available, particularly if you hook up with a club or maintenance organisation. I was involved in setting up a group to acquire an aerobatic trainer/tourer for public C of A operation (although that aircraft is not solo rented), so PM me if you want to discuss the idea.