As Embury says, there would seem to be some sense in using a Scotch-based liqueur and although this version of the Bobby Burns is rarely seen, it is worthy...
I didn't know there were at least three variations of this cocktail, and one with Drambuie. I haven't found enjoyable enough cocktails with Drambuie, although I've used half a bottle trying, but this one was very good for me. I used .75 Talisker 10, .75 Monkey Shoulder, 2/3 Carpano Sweet Vermouth, .25 Drambuie, & 2 dashes Peychaud's bitters with a lemon twist & a Luxardo cherry.
There's a minor typo in the "History" section, "Rob Rob" for "Rob Roy." But the drink itself is lovely--this spec, as given or lightly modified, allows the spirit to shine more clearly than many Bobby Burns builds. This might become my go-to for this cocktail when using single malts in general, but especially for subtle or delicate expressions.
Ok, Angostura is probably wrong here, but instead of Peychaud's I like the way Bitter Truth Creole Bitters play with the Drambuie. I upped the Drambuie a bit to proportions of 6:3:1. This also calls for a Luxardo on a cocktail sword.
I'm pleased to report our alcohol counter is now reporting a more moderate level of alcohol as we've now properly accounted for dashes and drips of bitters.