imho its ok to group it there. in the list on the overview page, i would put them in a 3rd section "Client Decorators" or something, to make clear these are not stand alone clients. we should add the async emulator and plugin client there as well. we should also have a section "build your own decorator" where we explain the decorator. each of those sections will need to specify the composer package in the intro.

alternatively we could add a note in the client overview page and link to an own documentation chapter on client decorators. but for me adding them within the clients seems easier.

opinions where this should go?

i would put them in a 3rd section "Client Decorators"

I agree.

Should we close this and create an issue, think @ddeboer does not have so much time, maybe it's blocking other to write this ? (As: oh! someone is already doing that no need to do that on my own)

I wish that was the case. 😉

I always have hope :D