Is there another +1 Charisma feat for a half-elf warlock who doesn’t want to be a “face”?

My half-elf warlock has 16 Charisma, and I’m considering taking the Elven Accuracy feat (XGtE, p. 74), which would boost his Charisma to 17. Since I definitely want 20 Charisma eventually, a +2 Cha ASI and a second +1 Cha feat would get me there.

However, every other feat I can find that offers +1 to Charisma falls into one of three categories:

  • Specific to some other race (e.g. Dragon Fear for dragonborn, from XGtE p. 74)

  • Redundant for a warlock (i.e. Resilient choosing Charisma, from PHB p. 168)

  • Related to being a “face” character (e.g. Actor, from PHB p. 165)

Since I am a half-elf warlock, and I’m not really looking to be a face character, these options seem to run counter to the sort of character I’m trying to build. Are there any other options? Charisma for my warlock is all about “spirit” and magic.

Any Wizards of the Coast material, including Unearthed Arcana, might be considered here.