Only shaking the cars down before events, not full blown stage testing. His main 'issue' in Sweden were the pacenotes, since he's not yet used to the speed of the car. That should come with experience though.
If you are a proffesional and have good pacenotesystem, then they should be good for any car. The road is the same, and that is what the pacenotes describe!
Even the president of French Federation himself is going to compete in Rome :)
https://www.fiaerc.com/en/news/pierres-ragues-to-driving-improvement-riches-in-erc
it is, end of the year. (but i don't know about anyone developing a new rally2, just people upgraing )
WRC mainclass from 2027