A direct pitch on top would work great. I've done it twice and one was my RIS (1.105), the other being a big Tripel. I've also done the wash thing for brews below 1.070.
I would try and rack off as much of the Irish red as possible, but I doubt you would get much flavor transfer to a big stout like you're planning.
Primary #1:Dunkel #2:Empty
Secondary #1: Peach Rhubarb Wine #2: Empty #3: Empty #4: Sparkling Elderflower Wine
Kegged: Piker Liker Porter, Umlaut my Kölsch V
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On Deck: Irish Red, Surly Bender clone, Spruced Warmer, CDA