'Looking for very 'analogue' online mastering'
analogue sound is a kind of cliche imho,
I could master a song purely in daw, aiming at having 'analog' feel
and have it sound more analog then mastering purely in analog tools - and aim in more modern sound - have it sound 'less analog' then real analog
seriously, it's up to engineer and skills
I am not claiming by any means analog sounds worst or better - just different, but knowledge&experience allows you to get out of your tools what you really want..
saying this I know there's no plugin for CUlture VUulture,
either vari-mu compressor
although I would be able to mimics very close sound/behavior those above
with plugins only
it will take much more time though