Yep, agree with literally all the comments here. In the absence of a replacement insert, my order of operation will be
1) Try sharpening and shaping the inserts
2) Check eBay
3) Check SHARS and the usual suspects.
There is a case 0, which is use the 5 "good" inserts. That surprised me that it worked that well, frankly. But a high quality face mill would indeed be a great thing.
Woodchucker, I'll post shots as you suggest. There could be hope I suppose. You guys are pretty sharp.