I don't know if there exists a cab/msu for integrating dotnet47 in 8.1, maybe MSMG toolkit has an option for it, but the LP has to be done manually or in audit mode or by setupcomplete.cmd (during install). I always install dotnet4.x + LP in audit mode.
abbodi1406, If those two cab files are integrated into the ISO, is that all that's needed to have everything updated to .Net Framework 4.7 (No need for 4.6.2 integration or previous hotfixes etc)? So all that's needed for ISO integration into windows 8.1 64bit is this: dism /image:c:\mount /add-package /packagepath:c:\updates\windows8.1-kb3186539-x64.cab