Advice on plan choice and usage

Hi guys, I wanted to ask some advices on using Miro for my use case. 

I work as a freelance consultant, and I work with several non related clients:

1. client A has a small team and it’s usually enough to share a board publicly, we work on several projects at a time with them. 
2. client B is a consultant himself and is hiring me to work together on several projects for his different clients. Client B has Miro account.

Me and Client B use Miro for work. I’ve got a consultant plan and have set-up a separate team for Client B, where I also have different projects set-up for the different client’s we work with. Now ideally I would like him to see all the boards we do for each of the clients and have editors access, get notifications, etc. And I would like to keep my work with other clients and personal boards separate (which I do now with different “teams” for each of the clients). What would be the best way in this case without me having to pay the extra 15/mo for having him on my team? Keep sharing the boards publicly (with pwd)? Or switch to team plan (our co-operation will last as long as the projects will - ~3-6 months)?

Hope I described the situation clearly. Thanks for your advices! 

Cheers!