Welcome, and good luck to you. Sounds like this change will be rougher for you than for those of us who love meat. I will just say that whey protein isolate is relatively "pure" protein and has almost no flavor, it just thickens whatever you add to it. The bigger problem is that there is no mention of FAT in your post, only your concern about protein. Your goal really should be to get your fat calories above around 50% at first, and at least around 15% protein or so. Avocadoes, olive oil, cream, butter, coconut products, etc. = those should be the priority for things you try to add first.
edit: I use why protein in post workout shakes, but 1) I'm a pragmatist not a philosopher, and 2) Its part of an attempt to build muscle for me. So I'm not recommending it in general, but I do use it.