Rotor Q often puts a bunch of holes in their rings, but unfortunately I'm not seeing 116 bcd.
I am seeing a few 106 bcd 3 bolt rings that might be able to be modified to 116 if you were very careful with drilling. Holes might overlap a bit, but it might be OK.
https://www.hoopriderparts.com/produ...040t%20-%20nos
https://www.ebay.com/itm/154583124549
However, did you look at this set,
36/50T?
https://www.ebay.com/itm/124826612608