There is an older, I think original version of Burning Bush that is awesomer. More tree like, tinier leaves.
They've turned them into brighter red shrubs for these landscapes, without as good of characteristics for bonsai.
You may be able to find them in your oldest parks. I believe they were planted in another era, when they first became imported and popular. Between the 20's and 50's I reckon, but it can likely be researched.
I'm not telling you this to stop you from attempting this. For me, it's just hard to use that second best thing, and for some folks, if it can't be the best, they won't even do it.
So of course it's not a waste of time, but...
Maybe it is?
Don't get a ticket!
Sorce