I have used something similar and found it strangely comfortable. There was a hip level barrier that I opened to step in, and it closed behind me effectively screening my hips level, and the side panels came out further at head level so acting like blinkers that horses have, so I could not see sideways. I then felt in my own little world and peed OK.
Hope someone gets in touch with you. There are about three others who have come from Belgium. If you like I could email them to see if they want to get in touch with you. However it is possible that their email addresses no longer work.
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