PS: Browsing through some aircraft sale platforms, there are apparently some Zlin Z526 and Bücker Jungmeister (open cockpit biplane) for sale (two-seat versions). Admittedly not heard of those before, anyone with pertinent experiences by any chance? CAP 10 does indeed sound like a nice one, too, but it seems that unless a certain wing modification has been performed, they are quite restricted aerobatically owing to safety concerns.
Some of the trikes look fine, too, maybe keeping the Citabria for TW instruction and getting a separate airplane for aerobatics, is an option for the club, too. Not my decision anyway (unless I suddenly turn filthy rich), but in any case, thanks for all input so far!
ACF