And, thanks to a trip to Tamborine Mountain Distillery, I have now made the proper recipe and the Apricot Eau-de-vie is nicely balanced by the Blanc vermouth.
For those (like me) who don't have Apricot eau de vie, I don't recommend substituting with Apricot Brandy liqueur (25%) but I tried it out with Poire William (40%) instead - as I am sure this is closer to what is intended - and this was pretty good; good enough for me to renew my attempts to access some proper Apricot eau de vie.