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Dave, not all return grills has a filter instead, it is at the unit itself. I have built special returns as part of the lower section of the cabinets for aesthetic reasons. Fake doors in front but grills on both sides. Sounds like like you have a bit of a mess or creative HVAC going on there? I see this a lot when with additions, those damn contractors just add to the duct work taxing the system to death and having not enough air flow to the new section, so the owners turn down the temp. trying to cool the hot part of the house. Hot in the Inland Empire. Thankfully Claremont isn't as hot as Rancho or Fontucky or any of those places east of you. Nasty hot out there.
I have a love hate relation with those mini split systems. I started to installed them right before they became popular, but hated the look of having a big old box on top of the wall, but they work well and cheap to install. Did I say they look like CRAP? There has to be a balance and in your case, aesthetic is the most important in this house. I suggest against it base on just that. You may be able to hide that on top of a tall cabinet where it isn't visible from the ground unless you go looking real hard. I've installed them near the top of the closet and built a chase to a grill above the closet door for bedrooms. All you see is the grill. Pain in the ass to turn on because the signals from the remote is blocked but the owners wanted it out of the way out of sight.
If you need to talk house, call me. I am more then happy to come out and give you my two cents over a cup of coffee. I can't do the actual work for you because I am committed for 2019 and 2020 but you don't need me for that. You know a bunch of guys that will do all that.
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