I've been doing some more thought experiments about a possible clip. Using a capture from the video, here is a rough position outline of where one of the two normal clips may be positioned. (Just guessing at possible clip length and width based on a wire clip)

The area at the bottom left shows an expanded view of where it may intersect the standoff screw and edge of the scale.
Wire deep carry clip: This would allow for deep carry. But, if this were used, the groove for the wire would likely intersect the edge of the scale. That would make the edge slightly weaker, more prone to breaking at that intersection.
Normal clip (like Para 3): The triple holes for mounting would make the mounting area of the clip substantially wider in addition to leaving the three holes when not mounted on that side. If not using the standoff screw, it would also put all of the three holes through the scale near the edge of the scale. That may make the entire end of the scale on both sides a bit weaker.
New clip design:
Compared with my prior design, this would not require any movement of the standoff nor as complex of a clip design that wraps around the end of the handle. Other than a minor change to the scales, the knife would be of identical construction to the prior version.
This clip has a side profile similar to a non-deep carry clip like that of the Para 3, flat against the scale where it mounts. But, instead of the triple hole mount, it uses a single mounting hole and a (longer) standoff screw. (It is possible a longer screw may fit into the standoff without requiring two separate lengths for use with and without the clip.) If nothing else were done, the clip would rotate around that single screw. The black dot is approximately where a small indentation is in the scale. As that indentation is only partial thickness similar to a wire clip groove, it would not overly weaken that area of the scale. A detent on the underside of the clip fits into that indentation. That may be enough to prevent clip rotation around the screw. (The sharper the edges of that detent, the more rotation resistance there would be. That is also partly affected by the strength of the scale material as a weaker material may break out of the indentation more easily.) With only the detent on the clip in that area, the edges of the clip could be tapered to better match the scale shape. With the clip removed, only the indentation remains to indicate where a clip may go thus making it a lot cleaner looking for formal mode dress.
This may allow both for good looks without a clip and the option of a clip for those who prefer it, hopefully along with the slip case as well.