Sounds like the easiest way out would be to weld on the lugs (per qualified procedure) send them back to heat treaters and then the lugs can be removed at your convenience when the part returns to your shop.
I feel your pain...I was fired back in 1991 over a weld-on lug incident that failed during the lift. No collateral damage, it just broke off as soon as the rig put a bind on it (Quenched & Tempered steel part) same senario, "hurry up!! git lug eye on'er and git truck outta here! (I hated that foreman anyway, he was a neanderthal)". I was just the welder and "did what I was told", but someone's head was going to roll since there were so many on lookers.
The lesson learned is that every weld I make IS MY WELD and I don't touch nothing with out all info available now.
When it comes to proper rigging practices, even a 100 ton solid steel sphere can be lifted safely with out weld-on attachments. The weld on a lug trick, as we did often in the mines is just a fast way to cheat and often begging for mishaps.