Reland #7143 ([X] simpilfy and avoid duplication in conversion)

[mattleibow]

Had to revert https://github.com/dotnet/maui/pull/7143 due to a crash on all platforms (see https://github.com/dotnet/maui/pull/9266):

Pushed the commit to a new branch: https://github.com/dotnet/maui/tree/dev/reland-7143