Yep mixing and matching full sized LFEs and the minis off of the same Buttkicker amplifier will not necessarily yield problems, the minis would run at their full potential but given the power load running off of the same amp, the full sized Buttkickers will not be running at their max potential. So mixing and matching will work, the minis will run full power, the full sized kickers will be hardly breaking a sweat.
Either upgrading the 086, 088 and 45004 to full sized LFEs has been done but this would be DIY, not a factory option available from Berkline directly. Same goes for downgrading the full sized chairs to mini Buttkickers, this can also be done but again DIY. Hope this helps.
I wish Berkline would make the minis available on all their chairs, more than enough power to add that extra dimension members are seeking to the theatre experience and much cheaper to boot.