What vegetarian substitute for prosciutto could I use in Carbonara

I have found a few recipes on the web:

• Vegan Worcestershire sauce
• Vegetarian oyster sauce

There are also a few hard to find ready-made vegan Worcestershire sauces on the market, such as Annie's.

When I read these recipes (which I have never made) I can tell that their flavor profile is missing some key aromas present in the original Worcestershire sauce. As strange as it may sound these sauces could use some of the aromas found in Parmigiano-Reggiano and in broccoli.  Whichever recipe works out, someone should write a blog post on this topic.

I'd like such a dish with courgettes, or mushrooms. Chickpeas sound like a good idea, butternut squash might be good as well. Sweet potato, perhaps.