How to remove all lead to allow welding?

Lead was used for a lot of year and sorry people its not dangerous as made out unless you shoot it into your arm with a needle.
Thousands of tire guys used lead wheel weights for a lifetime will no ill effects.
I'm not saying shower with the stuff, but...

Weld it from inside. Quick tacks to fill holes and not loosen the seam up on the outside.
From the front take a small pocket knife and lightly ream out the holes to fresh led. a tad larger just to clean off the bare lead to fresh lead.
Go to the auto parts store and by a 2 part mixable product called "All-Metal" and just like plastic filler
with the same spreading tool put just as much on as needed and fill the hole only- no build up, use the tool to smooth flush.
throw a few coats of primer over the area and lightly sand the primer but dont break thru.
Really simple.
S/N: leave the holes and replace the emblems. Those IMHO look really cool.