Is deploying .NET Framework 3.5 possible in WSUS?

ok - I have an answer for this problem - not the one I hoped for... but it does work. If you grab the .cab file from the Windows install disc under sources\sxs then run the command:

dism.exe /online /enable-feature /featurename:NetFX3 /source:"sources\sxs"

Windows will install dotNet offline without affecting the WSUS configuration. This would be easy enough to script into the logon script. I've tried it out on Windows 10, so I guess it would work on previous OS versions too.