Getting Rid of MSOUC.EXE
If you delete MSOUC.EXE, it resolves nothing, it will be reinstalled right back, OneDrive connects to Microsoft Server for updating and fixing errors, so it will be reinstalled.
First and foremost you need to disable MSOUC.EXE in Windows Firewall from both incoming and outgoing rules before deleting it:

You list the complete path in the firewall as follow:
C:\Program Files\Microsoft Office\root\Office16\MSOUC.EXE
Not a good idea to list it as
%Program file****Microsoft Office\root\Office16\MSOUC.EXE
Now you may delete MSOUC.EXE.
At this point, Microsoft server won’t be able to reinstall it back; however I went one step further:
I deleted these two files which are used by MSOUC.EXE from this folder:
C:\Users\User Name\AppData\Local\Microsoft\OFFICE\OTele
{CBCDE49F-946D-4BD9-96C5-8598BBBDBDDC} (0) - 4732 -
msouc.exe - OTele.dat
&
{CBCDE49F-946D-4BD9-96C5-8598BBBDBDDC} (0) - 4732 -
msouc.exe – OteleMediumCost

Now you can be certain; MSOUC.EXE won’t re-infect your PC again when you activate OneDrive, its Setup will pop-up but terminated in a split second by the firewall rules, it won’t be able to communicate with Microsoft server
and reinstall the MSOU.EXE back.
I tested it 12 times in the past 24 hours and Microsoft server failed to reinstall MSOUC.EXE in my PC.
If anyone knows of a better solution, let us know!
P.S. This last step is not required and I don’t recommend it, I deleted every entry in the registry pointing to MSOUC.EXE except the four belonging to Firewall New Rules, those stay put.