Totally, and soft tofu also makes a kickass frozen yogurt substitute.

Just be careful not to go overboard with unfermented soy (aim for no more than 1 portion/day), because the phytoestrogens can potentially muck about with your hormone levels.
I like using New Zealand grass fed whey - for one, it's a waste product from cheese making so you're not increasing consumption beyond what already exists, and secondly NZ typically doesn't use feedlots (ie. less potential environmental impact). The best vegan powders I've had luck with are Vega, Sun Warrior, and a few no-name unflavoured/unsweetened options I've found locally. Wishing you luck!