I've done loads of tiled floors, laminate and lvt click flooring before.... just never glue down lvt, so I'm just trying to understand it. I'm not saying you're wrong, far from it.... I know nothing about it. I'm just wondering what it is about P5 chipboard that makes it unsuitable, where as ply is fine. Why wouldn't you use a PS adhesive....
You want a high Temp adhesive if any direct sunlight on the floor as the LVT will shrink on the header Ends.
F48 plus is better For LVT.
The Chipboard will move over time and the joints will show through the LVT. Also the Adhesive won’t fully bond due to wax’s on the chipboard.
you need to plywood it then feather screed every joint.
I’ve uplifted a few off chipboard and you always see the lines every 2ft.
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