Yeah yo for sure can, though you probably don’t need to simmer for as long with everything combined if it’s just mushrooms.

I would do a variety for a bigger range of umami flavour, (et 3:1 cremini:shitake), then add a bit of msg, it’ll hit hard. MSG optional but it’ll hit hard.

I think you can also fake mallard reaction (browning meat) but I don’t know how bc I’m not vegan.

Worcestershire also could help, but idk if it’s vegan