 Finally get a chance to try, not working 😂😂 (re @lynorian: I haven't tried this but there is a way to change what window manager lxqt uses if openbox can't)
 oh, it is working!
 I just didn't noticed it previously
 https://matterbridge.lubuntu.me/bad44658/file_4421.jpg
 https://matterbridge.lubuntu.me/fddd0aab/file_4422.jpg
 Never thought I could use fluxbox this way, 😂😂😂