also the recent phazon installation at cocoon club in frankfurt/germany has a6h mixers in the booth, but i guess that has sponsor reasons, 'cause allen&heath is an official partner of the club.
and by looking for isolators and mixers, you can still check out what this guy is doing: http://www.electronique-spectacle.com.
as living in portugal shipping costs should be affordable and you can try and test them and send the stuff back if you don't like it. i still haven't tried it by myself but hope to do so in late summer.
at what frequencies will you isolator work? any details you can tell by now?