Vendors wanting phone calls

In the contact form on their website, mark your contact preference. If that is not an option, add the info in the “special request/additional information” box. If they are not responsive and empathetic, then move to the next vendors on your list.

How are you wanting to communicate with them? Snail mail, email, text, in person?

You could just list email as a contact method and nothing else

You may want to hire a wedding planner to take phone calls for you in that case. It's much easier and faster to have a phone call and follow up via email. Alternatively, have your partner talk on the phone with them. I don't really see your wedding vendors being okay never speaking with you.

Is it possible to either have your partner with you on speaker phone when you talk with vendors, or have your partner handle all the phone calls with vendors? My husband and I mostly communicated with our vendors only through email/text, though we also needed to meet a couple times in person and/or through a Skype meeting or phone call with each of them. Sometimes it's easier to have an in-person or phone conversation than to discuss through email. It also can make you feel more at ease on the wedding day if you've met with them in person beforehand.

One useful thing with email is that you have a record of what the vendors tell you. If your partner talks to them on the phone, it would be good to record the calls and let them know you are doing that. Then you would have a record of what is said.

Would video over computer (like Zoom) work?

One approach could be to kindly let them know that you prefer to communicate via email or text due to your busy schedule. You could say something like, "I appreciate your interest, but I'm currently handling a lot of details through written communication. Could we continue our conversation through email or text?"