I should have mentioned the contact option. I mistakenly read you first post as saying you wanted the player to interact with a "tree" which wouldn't be an option for reskinning the contact. Now I see you just were talking about the dialogue tree. My mistake.
I have a related question. When skinning an NPC contact as a console, it there any way to get rid of the "Talk to..." that pops up? Right now when I go to interact with the console it says "Talk to Computer Console." Or is this something that most Foundry authors just ignore?
The 'work around' for that requires eating at least 2 if not 3 objects in your budget for a map
2)a dialog popup
3)an invisible object(or shotglass if you want to go 'old school') (potentially optional this one)
you can either set the popup to be hidden>visible on interacting with invis object or the console itself
I have to note though, doing this WILL NOT ALLOW MULTIPLE INTERACTIONS, unlike the NPC contact, you can only interact using this method once, but it does allow you to define the interact button as you wish
Look under NPC Contacts and search for "console". There are seven types of consoles you can use and, like all NPCs, they support the Default Prompt which you can make more complex with the Advanced Dialog Editor.