Reddit mentions of Ideal 30-682 Power Plug Luminaire Disconnects, Orange (Pack of 10)

(Just a note, you might want to mention that by "standard light bulbs," you don't mean incandescent, but rather your LED Hue bulbs with a standard screw base, as opposed to an integrated LED module. That's why people are worried you're going to do something like put a 100 watt bulb in an airtight housing, which isn't what you mean)

Like you have discovered, those housings are designed for all-in-one modules, and few kits exist to "retro-retrofit" from module style back to regular lamp base. However, you may be able to make this work! I'm not positive if they would fit, but if the housing doesn't already have one behind that cardboard, you may be able to use a lamp bracket like this along with a socket like this to be able to install screw-base LED bulbs. Be sure that the wattage of the Hue bulb is within the limit of the housing, since they're airtight and only rated as safe when installed and used a particular way. Anyway, those sockets have a "pigtail," aka plain wire ending, so you can either add connectors that plug into the ones inside the housing, or wire them inside the junction box attached to the housing (consult an electrician, which I am not, before doing that, however).

Another note, according to this post, Halo uses different connectors than most other brands of LED downlight/recessed light, but you can buy the standard ones. They're made by IDEAL, here is a listing for them on Amazon; I'm sure you can buy them from other vendors too. You could replace the connectors in the lighting housings with those, then attach them to the socket pigtails too to plug them together.

Good luck, and be safe! Like I said, I'm not a pro, so talk to one before starting on this project!