I'm one of those who is defends Bellerin and doesn't believe we can replace him easily with the various folks who are often suggested.
But I would go all in on this guy. As an athlete he is peerless. He is one of the fastest players on the pitch. He gets lots of sprints up and down the pitch. He also uses a combination of both beating the man, and passing up and down the flank to get up top. He's built the former in later, having been weaker on take-ons at first. He's about as complete an attacking fullback as you will find. And the headline numbers speak for themselves. I think last year Dortmund, he had 5 goals 10 assists.
He can still work on tackles. He is not Bissouma in this department. I think he has about a 40% tackle success rate. But he is disciplined in Conte's defense and gets back to track his man.