It seems there are a fair number of users who have their https://obsidian.md/ vault indexed in DEVONthink. I use the following keyboard maestro script to quickly open the current DEVONthink note in Obsidian:
This basically just copies the name of the open document and enters this into the Obsidian quick open dialogue box. Hence, it obviously requires the note was indexed from an Obsidian vault originally.
I imagine this could be replaced with something more sophisticated now that there is an obsidian:// URL scheme but the above has been working fine for me.