Well, I caved.
I bought that bundt pan just for this project but then - like Peggy pointed out - I realized I didn't know how to put it together. When the lack of how-to hit me (couldn't find anything online either, unbelievable!), I plopped my chocolate mint in it instead. Now I'm going to collect deep cake pans and put chocolate mint in them - save myself the calories of the real cake, and the headaches of runaway mint later on.
Now I need to find a nice pitcher for the lemon mint!
Yes, I do believe I have lost my marbles at last.