I had a search last night for the remote phosphor LEDs and couldn’t find any, but just did a quick google for 360 5mm LED and there are a few in the image search.
The other ones I thought may be good for a even light are the filament LED, like you get in retro bulbs. They are easy to find on eBay, aliexpress etc.
Maybe sanding the dome on one of rngwn’s LED’s would result in a comparable light distribution? There would be a little bit of light loss, but it should diffuse it.
I have thought about trying those filament LEDs, they do seem like a good idea for small lanterns. I was always curious though of their efficiency vs. amp draw, as the filament LED used a couple dozen tiny separate LED diodes along a micro PCB strip, coated in a remote phosphor “tube” as such, versus a single remote-phosphor 5mm that uses a single LED diode in the center. Some of those 5mm LEDs in that 360 degree search does look close to the ones i have.
Just 2 cents, by sanding down the dome of LED, you might want to leave some slight arc to mitigate the output loss due to (total) internal reflection. (And that’s the reason why the wide angle LEDs are strawhat-shaped)
For regular LED epoxy, the refractive index should be about 1.5, which translates to ~41 deg of critical angle. That means the incident angle from the phospors to the furthest edge of the dome should not exceed that angle (or try to minimize the distance towards the edge where the critical angle would be exceeded), or the light will go backward due to the internal reflection.