http://www.outlanderphevforum.nl/forum/viewtopic.php?f=10&t=3548&start=25&hilit=pioneer (learn Dutch first)
In short and AFAIK: You will lose the specific PHEV-functions, but get 100% iPhone functionality in return.
Where did you find the C-rate from the battery?
You do not need that much power to maintain a certain speed. So what's wrong with 60kW? Both e-motors combined are limited to 60-70kW anyway. So please elaborate.
Are you sure? On the Dutch forum I read the preheated water mixes with the non-preheated water from the ICE once the ICE starts.
Wild guess: you have a tracker function coming up for the app?