If I get this right, what you really want is not another recipe, but another entity, so you can place both the original UV-lamp and the inlaid version. It wouldn't be too hard to add a new entity, recipe, and item. However, it would be useless: You could place both UV-lamps, but only one kind would have an effect. Will-o-the-Wisps adds all UV-lamps to a list when they are placed, and will only act on entities that are in this list. Currently, it looks just for its own UV-lamp, so it wouldn't register the other kind. This must be changed on the other end.
Well, what I was looking for was the normal UV lamp recipe left as is, then have a separate inlaid UV lamp recipe, but ok, I didn't realize that about how the other mod works. Hmm, I wonder if that mod author is still active.... Maybe they'd be willing to add a remote.call() to their mod so that other mod added entities could be used? I'll ask. :)
(I’d almost like to see the inlaid recipe be a bit more expensive/use some brick or concrete, but I’m assuming I should bring that up to the other mod’s author).
Do you mean the recipe for the default inlaid lamp (not the inlaid UV-lamp)? I guess I could make that more expensive as well.
Yeah, sorry, didn't notice that the inlaid UV lamp has the regular inlaid lamp as a recipe requirement. So, yes, the regular inlaid lamp I think would look better (make more sense?) with some added stone brick/concrete, maybe? Doesn't have to be much, just something to symbolize you're (essentially) pushing this lamp down into a hole in the ground, and the brick/concrete is used to shore it up/make sure it doesn't sink any further when something (like a car) passes over it. If you do this, I would recommend it as a setting that defaults to current behavior, though.
EDIT: Scratch the whole comment on adding brick/concrete. That really should be a request I'm bringing up with the inlaid lamps mod, not this one.