I see that there's already a post about digital rowing, https://support.zwift.com/hc/en-us/community/posts/202105085-Digital-Rowing?input_string=rowing%20and%20skiing
I too have rowpro from digitalrowing.com, you can row online but I've never done it so can't speak what it looks like or how well it works, etc.
I have both a rower and a skier, http://www.concept2.com/indoor-rowers , http://www.concept2.com/skierg/concept2-skierg and logged >5 million meters on the rower and >1 million on the skier. I would love to be able to row/ski in zwift, there's info here on the SDK and software, http://www.concept2.com/service/software .
I think right now you have to physically cable the row/ski monitor to a laptop, same for a smart device.
There's a pretty big indoor rowing/skiing community both for folks that train for the outside sport as well as folks who only row/ski inside, like me. Check out http://log.concept2.com/log.asp. Billions of meters rowed per year.
I'm sure you guys could bang out something for the rower in no time :-).
that said I'm really enjoying zwift, I ride almost exclusively indoors and always on zwift, it's GREAT, RIDE ON!!!