I make mine with 45mL of the Ultimate Mai Tai rumblend (equal ratios of Plantation OFTD, Xaymaca, Smith&Cross, Appleton 8 y/o) and some tiki bitters or chocolate bitters. When having a sweet tooth, I sometimes add a 20 mL of dark creme de cacao or homemade banana liqueur absolutely delicious!
All wines and fortified wines oxidize quite rapidly after exposure to air. Probably best to vacuum and store in fridge or leave out the wine and add that later.
Tried it with four roses, monkey shoulder, bulleit rye, homemade amaretto, and manzanilla sherry. Very tasty but i recon the madeira would make it truly shine