Ok, here's a quick update on rooting guava cuttings. I just noticed one of my cuttings from a variegated guava that I just pushed into a pot laying around in my garden had new leaves growing. So, it looks like it will have roots soon, this cutting was in the pot for over a few months so it should continue to grow. I'll post a few photos of this rooted cutting later tonight. I may just need to root most of the Sylvia guava, may be easier than I thought.
Another forum member showed me his success in rooting guava cuttings, he used the same method as rooting mulberry cuttings in a pot with plastic bag cover.
Pat's Barbie Pink, rooted:
My variegated Honeymoon guava rooted: