I have one Pi-Top 4 with the original robot kit from Kickstarter, and another with only the Inventor’s Kit. The second Pi-Top 4 would be much more useful to me with the plate. They actually seem port-deprived without it. The plate adds a large number of very useful ports with standard connectors that a person can actually order, unlike the plate itself. The Pi-Top  is a weird beast, but you did solve the problems kids trying to build the , with the little screws, etc.
I just received a couple of  systems from eBay. When you ship me the two I have on order from you, I’ll be drowning in s and thinking about hosting some online troubleshooting/education stuff. I’ll be able to review the CM-4 to Pi 3B adapter and the Zero 2W to Pi 3B adapter as well at that point.
My (frustrated, but polite) best,