I have an application (low-profile video switcher control panel) where I would like to use these Panasonic EVPADK04K switches.

I need R/G lighted indication (industry convention: Red = on-air, Green = preview)
These switches are nice low-profile and provide a 4.1mm "hole in the middle" to deploy the lighting.
But I am trying to find a nice bright R/G LED solution that would fit into that 4.1mm dia space constraint.
I fear that the ordinary SMD LEDs that will fit within the 4.1mm diagonal are not bright enough to shine through the button cap.
Unless I can find molded buttons, I am fabricating my own from white translucent acrylic.
There are SMD LEDs that mount from the back-side of the PCB, and shine through a hole in the PCB.
But I don't know what is the proper name for that style?
Ideally I would like something like a fully-controlled RGB component with integrated controller (what AdaFruit calls "NeoPixel")
But those are much to large to fit within the 4.1mm dia space.
I suppose, worst-case I could simply use ordinary 3mm RGB (or RG) LEDs poked in from the back-side of the PCB,
and fold over the leads to create a DIY surface-mount kludgy solution.