Any input ?
Yes, try it , but not with a camera on top (unless it is already broken)
The idea of the pack is just to provide a base to attach the tripod too.
As shown on the first shot ,depending on the weight of the camera and the weight in your pack, that might be enough.
Having the "monopod" low (trekking pole collapsed) helps and there is no need for a lot of shots for the extra height.
The higher the "monopod" and the heavier the camera, the more weight you need at the bottom and/or more secure guylines.
BTW, this is not exactly an original idea, but since most don't get it , this is an example of it :