R. acicularis x Tigris to produce tetraploid Hulthemia persica hybrid?

Me, I don’t have much plans to work with Tigris. It will be something for me to put on the side lines. Having Tigris is nice enough for me because of its novelty value. But one day I will get R. acicularis and thought it would be rather intresting to cross them two. I think R. acicularis has enough vigor and disease resistance to pass on to Tigris seedlings, which are, remembering from what I read, very weak.