>>> I've experimented in the past with just getting the Brisa color matched by the spectrophotometer at Home Depot and smearing some Sherwin-Williams-type paint on the edges. However, the paint isn't thick enough to level with the rest of the upholstery.

Leather Glue 3D the new version of Bond 3D dries to clear and is used to build up repairs. In this case, since the paint isn't thick enough this Glue 3D might be just what you are looking for, to complete your color-matching repairs.

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See this Bicast and PU Leather Repair Kit BP3 from this link:
https://leatherdoctor.com/bicast-and...epair-kit-bp3/