Worship an Elder Evil and pull of a Dark Chaos Feat Shuffle?

Do you stop qualifiying for your mark of healing if you become a Dragonborn? I suppose that RAW, indeed you do. But you might be able to convince your DM to let you keep it, "it's a property of my soul and not of my body" for example.

If so, then you can take some halfling-only feat at level 1, judiciously take Dragonborn at level 7, and bam, you get to swap your halfling-only feat of level 1 for it.