Just use a VM or extra laptop. Client work and business in general is a combination of tradeoffs. Typically clients are coming to you to alleviate a stress in one category. Don’t add another layer.
The other point here is also clearly security - one compromised client's crapware shouldn't compromise the rest.
That said, I already tried using zoom with a QEMU VM but I was never able to get the microphone jack to work. I should try again.