First, clean your microwave. If things are picking up flavors from your microwave, that’s a you thing, not a microwave thing.
Second, just cover things that you put into the microwave. You can get reusable covers, or you can often use a paper towel.
Third, a kettle is still better than a microwave for water.
Tea is an odour sponge. Russian caravan in it’s original form obtained a distinctly woody smokey flavour just from being too close to a campfire. It’s simulated today by mixing kemun, lapsang soushong, and oolong. But tea will take on the flavour of anything it’s left with.