Bill I am not the VFD expert, however on the Canadian forum there are a few, and the use and addition of or changing of VFD to machines are discussed often enough.
So to show that these experts have no problem with shutting down and starting up of the VFD I’ll add this and if you want there is more on this and other threads on the forum.
You can see that this person has used the VFD for years and shut it down and start it up with no problem.
VFD question.jpg
Here is the first answer to the question of a spray gun activated trigger for the VFD to start and stop, there aare several more answers.
First answer.jpg