Archetypes offer an easy path to re-creating older psionic classes. Soulknife and Lurk are probably more functional as archetypes of existing classes than they ever were as standalone classes. Monks were a psionic class in 4e as well, and most people around here would have been familiar with Tashalatora builds that could be expressed as a monk archetype.
I would make Soulknife a feat. For the ability to conjure a magical weapon, there is already Warlock. So that really just leaves Knife to the Soul, which can be a feat for Rogues/Assassins.
Similarly, I'd actually just make Arcane Archer a feat, along with many other alternative base classes and PrCs, like Beast Heart Adept, Force Missile Mage, Spell Sovereign, Swiftblade, Spellthief, Warchief, and others. Most have a single 'shtick' and the rest is filler advancing base class features, or numerical upgrades.
(I actually did these before, along with a few other feat conversions.)