: If anyone has a
: more aesthetic technique to share it would be greatly appreciated.

I might clean out that large and long middle one that looks like it goes down the keel line and glue in a sliver of wood. Cut the sliver a bit wider than the gap, compress it in a bench vise, apply some glue in the gap then press the sliver into the gap. It will expand with the glue and completely seal the gap. No worries about color-matching that way. Scrape off the excess when just dry.

Jim