I think that any non-DIY options will require removal of the third row. Second row shouldn't be a problem, many use the second row folded flat as part of a sleeping platform. One option would be a single ARB drawer and keep one of the third-row seats installed.
I just went down this road and ordered the platform-only setup from Air Up Gear Down (which requires removal of third row). Put it together last night and hoping to install in the LC tonight. I decided that we wouldn't be needing the third row for a while, as we're not driving with anyone outside of immediate family in the near future. Plus the platform appears to be (relatively) easy to remove if needed to re-install a seat or two for a trip or event.
How removable is the system in case you needed to reinstall the 3rd-row seat when company is in town? The tutorials make it seem like removal and reinstall of the third row is fairly straightforward. Is that your experience?