Went with Bombay Sapphire and Luxardo Cherry with the Fernet. Used ratios from recipe. As Caspian and David have said, it's not sweet at all. The flavors are well balanced, one flavor doesn't dominate a sip, though the Fernet clings more on the aftertaste than the juniper and cherry.

A solid cocktail and a fine way to enjoy Fernet.

I agree that the Fernet prevents too much sweetness but I went with 2/3 oz ea of the liqueurs. Not sure if this is something an ancient Greek king would drink but why not! I love it and am thinking of rye for next time!

I honestly thought it would be cloyingly sweet but it's not at all. The mint and bitterness from the Fernet really balances everything. It benefits from the dilution though.