Heehee. . . well. . . as long as you have something ready should it become a problem, I say you should go for it!!! Really, with the plants and the SPACE that you have in that tank, unless Kaze is a beast, it'd probably be fine - it's a nice big tank for frogs and betta - and you KNOW that I don't usually recommend the two to be kept together, or frogs kept in community in the first place - but with you, and the care you take of your animals, I think it'd be wonderful. And I'm thinking that if the frog(s) were there first, or everyone moved at the same time. . . Kaze would be more likely to take to the change than if you added something to his existing territory. . .
Well, something to think about, anyway! If you aren't ready to do the frog thing yet, that's totally understandable, too. Part of that whole wait. . .wait. . .wait thing ;)
Can't wait for the water test!