I have yet to do this.
And I wouldn't have believed it 6 months ago.
But I have talked to people I trust.. who have said that you can go to places that sell brake pad material that you can simply cut to size (if necessary) and epoxy them to your cleaned metal 'shoes'.
It has also been done to a centrifugal clutch's 'shoes' by a person I trust.
The places you can get them are .... truck repair suppliers and vintage car restoration suppliers.
I'm not sure I would trust them on a high performance vehicle.... but for a moped or drum brakes on say.. a dirt bike... I think it will work fine.
I don't know however... if they are available in the proper thickness to suit a mopeds brakes.