include could not find load file: RezBuild error on Windows

[spsalefeve]

We're currently using an old version of rez (2.49.0) and would like to update to 2.68.4. Everything wees to be fine with the new version on Linux, but we can't build with Cmake anymore on Windows.
The first error is:

CMake Error at CMakeLists.txt:7 (include):
  include could not find load file:

    RezBuild

and other error follows indicating the Rez environment variables for Cmake are not set.
It appears the reasons for this error are:

• our cmake package has visualstudio in its build_requires
• our visualstudio contains the following code:

 if building:
        cmd = 'call "{executable}" x64'
        cmd = cmd.format(executable=os.path.join(expandvars("{root}"), "bin", "msvcEnv.bat"))
        command(cmd)

• rez now sets the build environment in post_actions_callback instead of actions_callback and it's too late

Would it be reasonable to use again actions_callback at this line when building?
Or do yo know any other way to run cmake via rez on Windows?
I tried to use vswhere as mentionned here but it doesn't return any installPath.

Pull Request

[spsalefeve]

Hello,
Could this PR be merged? It would enable us to update our very old rez on Windows!