Can a Paladin (or any class without Sneak or Hide/Invis) still...

[Loadsamoney]

...kill guards in High Keep, tank their reputation, and still be able to sell/bank there?

Two NPC's I'm looking at in particular, Bank Clerk Jaylin and A Clerk, are supposedly on Qeynos Citizens faction and not High Keep faction, and killing High Keep guards doesn't hurt this specific faction, so even if I become KoS to High Keep guards and citizens, these two should still do business with me, right?

High Keep Guards are corrupt, and I plan to wage war against them, the Freeport Militia, and the Corrupt Qeynos Guards (fully supporting the Knights of Truth) for roleplaying purposes. But I need to make sure this is actually a viable solo leveling/money spot as a Pally before I start killing my reputation there (and make sure it won't hurt my ability to do SoulFire later).