@Warlock
Skip the JBP.
Key points to remember,
1. The first 4 inches of trunk have to be interesting, or it has little or no potential as bonsai.
2. Common species used for bonsai are used because they work, junipers make wonderful bonsai. Even uninteresting junipers are better than straight long boring trunk JBP.
2. Corollary: exotics that you never heard of, as bonsai, chances are good they have been tried and they failed.
3. JBP - the climate in Austin Texas is near perfect for JBP, in less than 6 years you can have wonderful JBP from seed. No need to settle on poor for bonsai landscape nursery stock.
4. Find other bonsai people - Austin has an active scene, there are 3 dimensional and 4th dimension (time) aspects to bonsai that you will never get except hands on, in person. I'm hoping some of our Austin members of BNut will log into this thread and hep you find the best nurseries for stock, and supplies, meetings and who knows, maybe a study group, or a social group. Go to shows, workshops and demonstrations. See trees in reality, virtual only can take you so far.
I know nothing about the horticultural needs of sagebrush. If you separated the 3 trunks, you might have a couple good ones.
You could also do your 3 trunk sage as a "clump style" in which case you would keep them together. You have something there, but because sage is not common as bonsai, I don't know how much help you will get.
Wisteria are an ugly duckling, gangly and unkempt, kept hidden in the back of your collection, until the week they are in bloom. Then they shine.