Based on the comments before me, I modified today's example to be:
- 40 ml gin (Beefeater)
- 20 ml elderflower liqueur
- 20 ml Amaro Nonino
and I think this is the direction in which to continue.
The next iteration would be:
- 45 ml gin
- 15 ml elderflower liqueur
- 20 ml Amaro Nonino

Also, given the total volume, a Nick&Nora glass would work well.