Surely, you can’t mean a standard ‘Lambretta’ product.
However, flanged ‘Oilite’ bushes are available in various sizes, but I’m not aware than any equate with the kick start bush sizes, but you might find one that fits & would be usable if bored out.
There are also flanged ‘DU’ bushes which might be too thin for what you intend....
I think I came across one once in a Spanish sidecasing, I may have it somewhere but it was worn out. Can't remember how I solved it though so maybe you could get someone to turn you one up?
The one in my Eibar is a top hat type but is worn so was hoping to find another but standard bronze bush will do as these don't seem to be readily available