What do you think about my idea?

I assume that you could get this going. I've heard a couple of coffee ideas like this working through sidehustleschool podcast.

You just have to work the market. Contact people who drink tea! Contact companies and ask them about their coffee service and how they support folks who don't drink coffee.

They will need to see how you address their pain point. Is tea expensive? Is good tea hard to procure in their area? Is there a particular ethos of the tea that you will bring to them that matches their company culture? Is there a significant price difference?

There are a number of people doing this for coffee (pact.com) and even cheese toasties (cheeseposties.com) - One can only assume this would work for tea.

Maybe do it as a discovery thing, where every month you get a new style / origin of tea to try. So its always a bit of a surprise.