Do not know if you already lookup there, but we have an interesting thread for high CRI bulbs with a dedicated list of bulbs we tested on BLF.
Regarding your two needs :
- "Yuji" bulbs and "waveform" bulbs seem to both fit all your specs. Both have full tests thanks to maukka. Only potential drawback, ~20$ per bulb.
- For such lumens, you can ask some custom makers, like "SunLike" to build something for you. He can go up to do 50W LED bulb from high CRI COBs. Drawback, the BLF test is not done yet, it will be in a few days/weeks. Might be a bit pricey too.
All those candidates are quite detailled (with links to manuf. and tests, etc) in the thread I refered to in my first sentence.
You might also have results by searching D50 calibrated bulbs. But, still, they will be pricey.
Which application is making you specifically look for 5000K ligts?