Good news is that Nuke ran, but throws...

...
Building stage 2 codegen project.
23:53:31 [ERR] Target Codegen has thrown an exception
System.PlatformNotSupportedException: BinaryFormatter serialization and deserialization have been removed. See https://aka.ms/binaryformatter for more information.
   at System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Serialize(Stream serializationStream, Object graph)
   at Nuke.Common.Tooling.SettingsEntityExtensions.NewInstance[T](T settingsEntity) in /_/source/Nuke.Tooling/SettingsEntity.NewInstance.cs:line 23
   at Nuke.Common.Tools.DotNet.DotNetRunSettingsExtensions.SetProjectFile[T](T toolSettings, String projectFile) in /_/source/Nuke.Common/Tools/DotNet/DotNet.Generated.cs:line 5507
   at LibHacBuild.Build.RunCodegenStage2() in /tmp/wat/nix/hactoolnet/source/build/Build.cs:line 658
   at LibHacBuild.Build.<get_Codegen>b__70_1() in /tmp/wat/nix/hactoolnet/source/build/Build.cs:line 206
   at Nuke.Common.Execution.BuildExecutor.<>c.<Execute>b__4_2(Action x) in /_/source/Nuke.Build/Execution/BuildExecutor.cs:line 119
   at System.Collections.Generic.List`1.ForEach(Action`1 action)
   at Nuke.Common.Execution.BuildExecutor.Execute(NukeBuild build, ExecutableTarget target, IReadOnlyCollection`1 previouslyExecutedTargets, Boolean failureMode) in /_/source/Nuke.Build/Execution/BuildExecutor.cs:line 119
...
/nix/store/pkvy24cwwrsg3q3rqkhak8k6j98ns5gy-dotnet-sdk-9.0.305/share/dotnet/sdk/9.0.305/Sdks/Microsoft.NET.Sdk/targets/Microsoft.PackageDependencyResolution.targets(266,5): error NETSDK1005: Assets file '/tmp/wat/nix/hactoolnet/source/src/hactoolnet/obj/project.assets.json' doesn't have a target for 'net9.0'. Ensure that restore has run and that you have included 'net9.0' in the TargetFrameworks for your project. [/tmp/wat/nix/hactoolnet/source/src/hactoolnet/hactoolnet.csproj]
    0 Warning(s)
    1 Error(s)
...

Either way, I was playing whack-a-mole with Nuke 9.0.x, so I wasn't having any luck with my plan either.

... warning NU1603: Nuke.ProjectModel 9.0.3 depends on Microsoft.Build (>= 17.11.4) but Microsoft.Build 17.11.4 was not found. Microsoft.Build 17.12.6 was resolved instead.
... warning NU1701: Package 'Microsoft.Build 17.12.6' was restored using '.NETFramework,Version=v4.6.1, .NETFramework,Version=v4.6.2, .NETFramework,Version=v4.7, .NETFramework,Version=v4.7.1, .NETFramework,Version=v4.7.2, .NETFramework,Version=v4.8, .NETFramework,Version=v4.8.1' instead of the project target framework 'net8.0'. This package may not be fully compatible with your project.

ah, seems it failed on hydra, and logs arent available: https://hydra.nixos.org/build/308971738

was cancelled though