I really enjoyed this drink, althoug the rye spice is a bit overwhelmin gin my opinion. Since I used italian Punt e mes and an italian apricot liqueur, I substituted the rye with aged grappa the second time, and the result was sublime! Try it if you can!
I'm not sure this is a good use of arrack - I used By the Dutch batavia arrack, and most of the complexity coming from the mash bill of sugarcane, date palm and rice was lost in this drink. It's also quite dry with such a small amount of benedictine. I would recommend just making an arrack old fashioned if you want to put the spirit to good use.
Great inspiration! Just a small correction, the description of the Santa Marta Daiquiri mentions the ingredient "Kirchwasser", which would directly translate to "church water". Kirschwasser is spelled a bit differently.