Thanks Craig, it is my favourite of the 2.
I would like to grow another batch of Lumas with more focus on nebari and basal flare. The thought of that cream and orange, flaky bark extending out onto a radial surface root display is appealing. I will probably grow them from cuttings for better control of the results. The weakness of these 2 trees is that they were created from ordinary nursery stock, due to that fact, they have their limitations. What these 2 little trees have helped to clarify, is that the species has a lot of bonsai potential, especially for shohin.
Escallonia grows like a weed as you suggest, I am a fan of the bark, similar to Callistemon or Melaleuca , but I don't like the flowers much at all, they seem to impede on the shape of the tree too much and my preference for flowers is somewhat simple in form. But I am growing Escallonia for it's bark and foliage, that is enough to keep me interested.
I may just take you up on your generous offer of cuttings of Chillean Guava, that sounds like a project for the spring, hopefully I will have the bugs ironed out of the fogging sytem in my polytunnel

.
Cheers
Mojo