Good day!
And the question is essentially the same.
Can you please tell me if it is possible to update the version of "0Harmony.dll" for compatibility with UnityModManager? Is this even theoretically real?

I am trying to make your mod work and others that require installation via "UMM", but it has its own file "0Harmony.dll" and it is incompatible with "0Harmony.dll" from the manager "UMM". As a result, either you have to give up something, or find a way to combine. Or another mod manager, without "0Harmony".

I'm not a programming expert and it might be silly, but I tried to copy the 0Harmony.dll file from the "UMM" folder to the "... AppData \ LocalLow \ AtomTeam \ Atom \ Mods" folder. And vice versa. It did not help.
I need to try with another mod manager, but I don’t know which one.

It is very difficult to imagine a game full-fledged without your mod, as well as without requiring installation via "UMM":
UI Enhancement
NoWeight (more reliable replacement for trainers)
Player Controlled Companion

See this thread: https://steamcommunity.com/workshop/filedetails/discussion/2022553676/3052863612120187138/

I know the UI Enhancement mod would not work with Neutron even if they used the same version of the Harmonly DLL.

A quick look at the other two you listed makes me think they would possibly be compatible if using the same version of harmonly.

you can remove the Workshop "Neutron" and install the UMM "Neutron" from moddb.com, google it, the mod will work properly with any UMM+Workshop mods, just config the .txt file