If you need some other voices for your model I might help you.
Openjarvis is nicely packaged and easy to use (at least if you use raspbian Jessie and not stretch). I use snowboy for offline hotword detection and bing otherwise. It works quite well in french (some problems with my 7 years old child)
As for the interactions it seems that the syntax is comparable at least for basic tasks. there is a plugin for rivescript called Rivescript bot.
Unfortunatly I can’t afford time consuming project right now…
I’m a C++/Python guy at work, but at home I go for the easiest 