I'm putting together a "Hellknight" Character and need some feedback

That is a good suggestion and one I have considered. A lot will depend on the party composition. If people bring more magic focus then I will lean to a Sword & Shield tank build, but if someone else wants to take that role then I can be melee damage support, or if no one is focusing on the magic side then I can double down on Warlock and maybe also pick up Ritual Caster-Wizard for some utility.

None of the builds will change the concept of the character though, which is my main focus now. And the first few levels are pretty well set: 1) Pal, 2) War, 3) War, 4) Pal. Its taken almost 2 years for us to get to level 7 in one game, so there is no sense in planning an "endgame" build.