As far as I know .wa files are directly integrated with WinToolkit.
.wa files are addons not installers so they are already silently added into the instalation.
Are you using them correctly as addons in WinToolkit?
Reworked .NET 4.7 addon:
- Implemented a workaround for auto MOFs compiling, no script required (thanks to @MSMG)
- NativeImages are now generated after OS installation, this allows to have fresh images that suits the OS features, and reduce the addone size)