there are variations of the broom style. Harry harrington also has an article about the forms on his website.
i posted a small hornbeam above that was started similar to the op's tree, with two primary branches on either side. you will also find examples of shohin zelkova all over the net, so they can be smaller trees.
"it’s just that you don't see too many examples of brooms even being attempted"
there are 100's if not 1000's of examples all over the internet.
i lost count of how many on show here alone.
I always like the collaborative threads were people posts trees in a common theme. I don't recall seeing a theme on broom styles. There are so many variations
ibonsaiclub.forumotion.com
actually, the above is a good, intense read for anyone who can be bothered.
with all due respect, youre giving styling advice but not fully clued up on the varied forms and no examples of your own.