Best method to upgrade to MM (+TWRP+Root) from Custom ROM (+TWRP+Root) on D855 32gb?

Current Phone Set Up
CloudyG3 v2.2 Lollipop stock based custom rom (Android 5.0, modem 20k)
Rooted (via LG One Click Root Method)
Custom Recovery - TWRP (v2.8.6.1)

I'm trying to work out the safest/easiest method to upgrade my phone to MM while also having/retaining TWRP and root.

Have read many threads and am frankly a bit confused...:eek:

Can someone please enlighten me?

Many thanks :good:

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