6.13.206.5 (O2) going back to Stock

I need to send my m8 to repair and for that I want to go back to stock with stock recovery+ relocked bootloader.

My device:
cidnum: O2___102
version-main: 6.13.206.5
S-ON

I forgot to make a nandroid after upgrading to MM and now I dont know how to go back to stock, since I found no fitting RUU or nandroid.
If I restore my stock L Nandroid and flash then the fitting Stock recovery+ relock bootloader, do I am able to install the MM update via OTA or do I eventually brick my device?

Thanks in advance for answers!

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