Hi Pirke,
I cannot comment on the RV in particular. Justed wanted you to know that I have transitioned to tailwheel + aerobatics rather quickly after I had obtained my PPL and I doesn't need black magic to do that. With a capable instructor a little patience and some training I wouldn't expect any problems in flying the RV.
If it turns out the RV is what you want I would rather go for the RV directly than to go for the hassle of purchasing and reselling a Katana inbetween.
Cheers
maehhh