Apart from bringing in climbing reenforcement, I think what Remco should come away with in this first duel against Roglic is that the Slovenian is the supreme cunctator. Primoz rarely grabs the bull by the horns, rather he always bides his time and looks to strike only when there is little risk involved and sees an advantage to be gained from the opponent's efforts.
Consequently, Evenepoel I think needs to control his killer instincts a bit, the born attacker such as he is, and somehow find a way to force Roglic to come out of his corner sooner. Don't give Primoz, in other words, the opportunity to capitalize on Remco's work by wheelsucking him. How this is to be done I don't know, only that it must be done to prevent Remco from assuming a domestique role for Primoz. Otherwise Evenepoel must drop Roglic to win the Giro, unless the TTs give him an advantage that forces Primoz to have to attack.