OK, you do as you please, of course. But any replacement original inserts you may be able to pick up will definitely be old, and likely in not very good condition.
Also, I have not seen any of my nuts rounding off and spinning around inside the lugs. On the contrary, the inserts get worn and suddenly will not thread properly, thus needing to be replaced with a nut, that fits perfectly in the lug and threads like new.
I am not sure what to make by your suggestion that I was cutting corners when I renovated my teardrops. But if you actually have personal experience of "nutted" teardrop lugs "rounding off" in the way you indicate, well then I bow to your superior wisdom here.
I wish you the best of luck in your search for original teardrop inserts in pristine condition.
/Magnus