Which blocking perks affect two-handed weapons?
Or do any of them affect two-handed weapons at all? Maybe you can block with a two-handed axe but no perks affect it?
I would hope that Shield Wall, being the base skill of blocking effectiveness, would help. But the name makes it sound like it is for shields.
The left hand side of the constellation (Deflect Arrows, Elemental Protection, Block Runner and Shield Charge) all seem to indicate specifically that they are shield only.
The bash series seems oriented to shields also ... tho I have never tried to see if I can "bash" with my two-handed axe. I'd rather just swing.

So, does a two-handed spec benefit much from blocking perks?