There are certainly lots that do at least one of those, and both are covered by various mods.
#1) There are plenty of ways to do this one:
GritEcon makes fighters the item of choice for defending against missiles.
They also provide some anti-ship capability with no supply drain on the host ship. (Where most ship weapons drain supply quite fast)
#2)
GritEcon makes mines weak, and forces a thinner deployment, but removes sweepers.
They are less of a wall to break down, and more of an area-effect delay tactic.
(Building a wall involves pumping out a screen full of satellites (mini-bases, which need to be repaired) instead
)