You can pretty much make any wine kit into port if you really wanted to, just do your math right. Brandy is added to the fermenting wine (after the heavy fermentation is over, a few days) to make the abv above the toxicity level of the yeast, around 18-20% I've been planning on making a "port style" Cider with apple brandy in this same way. Experimentation is needed though.
Primary:Russian River Redemption clone, Kelly's Melomel, Graham's English Cider 22-23
Aging:Public House Dry Stout, Procrastination Porter, Mr. Brown Ale, Westvleteren 12 Clone, Mead, Duvel Clone, Graham's English Cider 6-21, Belgian Draak Strong Ale, Fig Melomel, Acerglyn, Restorative Tonic Metheglyn