Thanks @DenisM that's most useful. When I get my car back I'll have a crack at modifying.Steve,
you may need to disassemble the spring loaded bolts* to remove the barrier ..that's the bad news!
The good news is that by cutting 1 1/2 coils from each spring and reassembling the bolts as per the attached post, you can then activate the bolts simply by pressing them with your thumbs. e.g. I can now install/remove the barrier in a couple of minutes.
*grip the bolts with pliers and unscrew the torx head
Check this post #17 https://www.theineosforum.com/threads/station-wagon-cargo-barrier.12410505/#post-1333218544
which explains "how"!
good luck with it
Cheers
Steve