evtripplanner seems to indicate it is easy, but for some reason, there is only a MX P90D option. It estimates a total of
65.7 kWh for the P90D, which should have worse efficiency than your X 75D. If you fall short after arriving in Paradise, the only downside was be going a little out of the way to the Centralia SC, which is no big deal. I would absolutely go for it!
I was pleased to see that my S 60 (non-D), now upgraded to a 75, can easily make the round trip, while it is marginal with a 60.
Model S loses something like 7 miles range per 1000' vertical, so Paradise is something like 5400', thus something like ~40 miles lost range, and you get back up to 60% going back downhill. I don't know the number for MX; perhaps 10 miles/1000' vertical??