Hello Joel.
Wow, Manila ...
I was told that it is tough (almost impossible) to repair the old torque converters, especially the cast aluminum ones
but maybe yes, blackforrest could do it.
First of all, make sure you don't have a hairline crack in the converter itself. As to the rivets, maybe those can be replaced. But please advice the shop to carefully balance the converter afterwards; this unit is allowed to rev with engine speed (i.e. up to 6'500 rpm).
'Some' Manila shops are certainly willing to help but with a "job" like that I recommend better highly MB-skilled shops like Blackforrest or so. Better sending a parcel worldwide than once to live with an exploding torque converter.
Just my 2 cents ...
Achim