That's good idea. I cut coat hangers and did that.They are effective in the short term. When the plant flexes its muscles you need to move to some other way to hold branches down. A strong branch moving upward will pull the sticks right out of the dirt.
You can make them yourself!
I use these soft wire ties for the hook part:
These thinner plant ties to tie that part on:
And a skewer to tie it tightly onto:
And that's it!
I call them CarcassSticks in deference to the 420 member @Carcass, who I believe invented the concept.
I juststoleborrowed his idea!
You can get all the stuff you need from the space guy (Amazon) or at your local retailer.