I am starting to collect classic racquets, and have already struck the obsolete grommet issue, so wondered exactly the same thing.
I'm pretty sure you should be able to find someone who can do it right now;
the low-end home 3d printer might not be able to, but the high-end ones can - see here -> http://i.materialise.com/3dprinting
Laser scanners can scan the part (beam must be able to see the whole contour, which it almost certainly could with a grommet strip) so you wouldn't even need a pattern - even an old broken grommet could be patched and then scanned.
heck even the DIY guys are starting to work with nylon, etc - http://www.engadget.com/2012/05/22/3...lon-extrusion/
cottage industry, anyone?