Did it with Damoiseau 50° agricole rhum, Select 1920 ( Venice red bitter), fresh grapefruit. The color was enough to please me, very nice taste, bitter but not so, fruity but not too much. Good balanced drink, added to my favourites.
Tequila seems like a more obvious choice of matching with the agave and grapefruit. I tried this first with Bacardi Carta Blanca, then Lunazul Blanco. Unbalanced both times. Too much agave in the latter. Would Pisco work in this? Let me know.
For me it was unbalanced. Yeah, there is less bitterness from campari in there, but everything else is more like separate in separation. Either agave syrup should be changed or something else is needed.
Very balanced , not negroni like, smoother and less bitter. Much more multi faceted. Nice coral colour, discard grapefruit twist, serve in a coupe. Perfect aperitif!