I know many folks will say "just find another company to do it." which is much easier said than done... If you know of a U.S. company that does this kind of thing, I'm all ears.
There is an idea, I somehow found the brochure of this company from 1988 year at the dump. They were great then. They are still alive, they have their own factory in the USA and they are engaged in contract manufacturing:
http://www.bihler.com/technology/contract-manufacturing/
Write them a letter. I see that their cars can make 5,000 parts per hour or more. The design of this clip is easy compared to what they can do. In one day of work, they can provide the HDS with clips for 50 years ahead.
The only thing I can't do is find out from them the price for a batch of clips of a certain amount, because I do not know the brand of steel and its heat treatment, the exact size and many other important details, I don't even have a drawing. They may even have a minimum order amount that may be too high.
The most expensive, I think, is the working parts that will directly bend the clip, but due to the simplicity of the form, the company may already have suitable molding tips (which move) and rods around which clip fold will occur.
Generally cool machines:
https://www.youtube.com/watch?v=K_BG3J_MSc8
judging by the video, these guys also have this car, you can call and ask them the conditions and the opportunity:
http://www.phoenixtooling.com/
https://www.youtube.com/watch?v=9XtyJTMiKZY
https://www.youtube.com/watch?v=400UM08TXW8
Maybe can cut a strip in 1 place, make 3 threaded holes in another place, make bends in 3 place, taking into account the time of work of machinists, these estimated 3 places to create 1 clip can stop in 9 laps of hell
