The new plugin is 53.7 MB big. The arm64 side is 26.2 MB in size and a bit smaller than the 27.6 MB part for Intel. Since disk space is no longer a problem, we intend to simply ship this file with both targets later this year and avoid trouble with clients installing the wrong version: Intel or Apple Silicon.
> file MBS.fmplugin/Contents/MacOS/MBS
MBS.fmplugin/Contents/MacOS/MBS: Mach-O universal binary with 2 architectures: [x86_64:Mach-O 64-bit bundle x86_64] [arm64]
MBS.fmplugin/Contents/MacOS/MBS (for architecture x86_64): Mach-O 64-bit bundle x86_64
MBS.fmplugin/Contents/MacOS/MBS (for architecture arm64): Mach-O 64-bit bundle arm64
Technically you can of course use lipo command line tool to reduce the code you don't need, but that breaks code signature.
Then you get an Intel only and FileMaker may tell you that there is no longer a signature included.
codesign --remove-signature MBS.fmplugin
lipo -extract x86_64 -output MBS.fmplugin/Contents/MacOS/MBS MBS.fmplugin/Contents/MacOS/MBS
Let us know if you have questions. We look forward to news from Claris about when they will support Apple Silicon directly.