Surprised that you think the seat is too hard.
I have done 120 miles and no issues with the stock seat. A harder seat might seem bad, but can be better in the long run.
It’s the same with cycling, The saddle that came with my bike was a gel one and quite soft, but it caused issues so l got a saddle fitting and the one chosen looked like an instrument of torture
But it’s the best saddle l have ever used.
Agree with previous posters. Rode to some friends over the weekend, 145 miles and just over 3.5 hrs each way without stopping. I couldn't have done that on most of the BMWs I've owned before the seats were re-padded, used to get a numb bum after a couple of hours riding.