IMHO, if you take
at least:
- 1 x 80cf/10L trimix bail-out stage
- 1 x 80cf/10L nitrox bail-out stage
on your first 100m dive (and your buddy carry the same), it should be a safe bet if you don't plan to stay too long at max depth. Of course, have support on surface to drop additional gas if needed.
No one dies from having too much gas. Be safe!
And you could always trim down (or increase) to whatever you feel comfortable with later on after a few dives at the same depth range.
Just IMHO...