SLIM,
very nice...
I feel you on maintenance in the living room and all, maybe an adjacent furniture quality cabinet, that can house the serviceable part of the filtration.
The other option would be to run the plumbing in-wall like you were thinking, then run a medium size bead filter and an efficient pump...
Bead filters are excellent and closed loop as well...then you'd have the power back-flush option for cleaning.
Seeings how you have a master plumber in-house you could run it in the basment and have the backflush plumbing dump to brown water or out into the landscape. It might be worth a look

very nice...

I feel you on maintenance in the living room and all, maybe an adjacent furniture quality cabinet, that can house the serviceable part of the filtration.
The other option would be to run the plumbing in-wall like you were thinking, then run a medium size bead filter and an efficient pump...
Bead filters are excellent and closed loop as well...then you'd have the power back-flush option for cleaning.
Seeings how you have a master plumber in-house you could run it in the basment and have the backflush plumbing dump to brown water or out into the landscape. It might be worth a look