I've been asking for this very thing for about 2 years and so far nobody will take up the job.
A couple different people have played with the idea and made a prototype but at this point it's all vapor, old vapor at that.
This is a big market just floating around with nobody to take advantage of. You want flood, 15 seconds later you have you M60F beaming. You need some real distance? You just toss in your Deerelight R2 XR-E with smooth reflector and you're good.
The flexibility ensures that the product stays viable for years and yet there is no one with the gumption to give it a go and make some money.
It's really not as easy as that. Nor will most people just want to "swap" dropins for a different need on the go.
This is why my design incorporates TWO dropin sockets on the headlamp frame.
But seriously, yes, I realize there's a market for it. However, I've been teaching myself Solidworks from the ground up for the last 6 months, going through one design iteration after another, researching materials, plastics, wiring, waterproofness, switches, battery pack options, etc.
It's by no means a "simple" process. It's not "easy". It's not "fast".
There's so much that goes into it. Especially if you don't already happen to be an engineer of some kind and you're learning every single bit of it from the ground up. Half the trouble is not knowing all the things you don't know that you need to learn.
So... I can't speak for the other's who might be working on this, but for me.... it has not been an easy road. I AM making constant progress though.
I mean, I'm doing all this on the side of working 72hr weeks of night shifts and sleeping most all day, working all night. If I had the time to just put fully towards this without having to work or eat or sleep, I'm sure it'd go a lot faster
Also, anyone can just "make something", but making something that is marketable is more difficult. Creating the process to make more of them is time-consuming. Putting in the design time to say "does this look hokey, or does this look professional" adds up quite a bit.
I have several factors that I'm trying to fit in, and when I fall too far outside my lines on one or several of those factors, I revamp entirely. I don't want some bulky monstrosity that sticks really far out and weighs a ton and isn't efficient and looks like it was built in a garage. It takes time!