I've not done it on the Orbea Rise, I 'may' it on both my Hecklers - an E8000 and EP8 - both with the most up to date firmware.
The Orbea Rise has a EW-EN100 juntion box on it - this is a pain because it means you don't have an easily accessible free port to connect the PCE1 to. But there is still one - it's on the motor, all you'll have to do is remove the plastic covers and you should see the spare Di2 port.
Failing that you'll need the
Shimano E-Tube Di2 Junction Box. This allows you to un-plug one end of the EN100 and connect this. Then you can plug in the PCE1 to the Di2 junction box and your PC.
It's sounds way more complicated than it actually is - everything just used the standard Di2 cables/ports. (except the USB into your desktop or laptop).
Then you open e-tube on your desktop to create the connection and lastly STUnlocker on the desktop (you'll need a paid for licence).
Then you can swap it to US spec. Once it is swapped over you can use STUnlocker on your phone to control assistance levels.
The pain of it is you need a sympathetic shop with the PCE1 and the Di2 junction box or you buy them for about £200.
It takes no more than 10 mins to do start to finish.
If you are in the UK/South East I'm happy to meet up and help out, I've obviously got the PC connection box and know what I'm doing with it now!