Found a slick way to incorporate Pluto TV channels into IPTV Simple client on KODI..
This allows you to make channel groups of selected channels..
I have KODI 20 (Nexus) so I load Pluto from the KODI repository.

1. Install Pluto and then in Settings, install the IPTV manager.
2. This will add ALL the Pluto channels to the ALL CHANNELS group.
3. In the PVR settings, open Group manager
4. ADD a new group (such as Pluto Movies)
5. Highlight the new group (Pluto Movies)
6. Select the Hidden Channels column. Scroll down till you reach a movie channel
you want, and hit enter. Channel will move to the Pluto Movies group.
Repeat to add more channels.
7. When done hit OK

Now in your TV guide you will have ALL Channels, and Pluto Movies groups. Selecting a group will
only display the channels in that group. Channels will have Pluto guide info, and can be played
directly by hitting enter.

I have multiple groups set up :

Pluto Movies, Pluto TV, Pluto Sports, and IPTV (for my playlist channels from the service)

Pretty Kool !