I'll give the U4Ts a chance, too! They could be a nice fit here. Since I only need the lighter switches in a few keys, the spring swap doesn't even feel like much trouble.
I think we don't want the silents here since the person I'm gifting this to prefers a longer travel distance, and dampeners shorten the throw. Thanks for alerting me to that detail!
Should I look for springs on Amazon or are specialized keyboard shops a better bet for those?