not worth it, I've done it in Explorer mode at lvl 11, on my second playthrough, it's an excruciating fight with a lot of RNG luck and some iron gnome bombs(check their traders to see what I mean, and some specific quest bomb) it's possible, ... keep into account all floors(70% of the first floor) will join the fight which will make it even worse, Larian kinda makes it obvious they don't want you to kill Gortash on first Encounter, i say kinda - because:
-once you enter Lower City you'll talk with a Steel Watcher and realize that now Gortash is dead, the Elder Brain has taken hold of all Steel Watchers and considers you an ally and gives you the task to kill Orin.
-all Flaming Fist and steel watchers in Wyrm Crossing and Rivington will be hostile until you enter Lower City
-Duke can be saved through other means, easier and more -story-wise means, you don't have to massacre all at once for that
-on Tactician Mode, i am confident this fight it's impossible or you can time the traps perfectly on other enemies with steel watchers self-explosions, you're a god.
.. and here I stopped because it does not seem right if I want to play a "good" character, not sure what happens after, probably the story will go normal nothing changes except few dialogs when you'll enter the Steel Watch Foundary - probably this decision is for whoever wants to turn into a Mind Flayer considering the first point, might just keep a save for the future and update then