Yeah I had the same idea to help people with this problem. I'd like with how classy the grilles are a lot of people would want them, even for 73s 74s etc even though they aren't original. I've been semi looking on and off for about 5 years.
OER is working on a repro one supposedly according to their website. But its said pre orders will be notified when its available to ship. I suspect they are seeing how many orders they get to determine if they should make a mold. I'd have to think even making one in multiple pieces which bolts together is better than not having one.