Okay.
It could probably work and Calm Blissey generally works best with 6HP/252Def/252SpDef, although you could try more HP and special attack too if you'd like. You can use Softboiled over Protect. Use Softboiled to heal Blissey in one turn and save Wish for the teammates. Mainly because a two turn heal can be taken advantage of.
Using Wish without Softboiled or Protect is really unreliable especially since Blissey is a sitting duck. Protect can help scout and heal Lefties too.
Sun stall works a bit better with Chansey though, and I explained why before.