will, these emitters are normal XP-footprint leds with normal voltage. The maximum drive current is 500mA. I found that you can not overdrive UV emitters like you can with white leds, even not on a DTP-board. The limitation is not the heat but physical limitations of the die. 850mA may be a bit too much. Edit: correction: just looked at my test of LG385nm leds (one gen. older than these btw) and on a copper board it can handle 2A, so I was wrong, 850mA is fine.
These leds for sale on Ali have a very elongated dome to give them 55 degrees beam angle, I’m not sure how these optically behave in TIR optics. What I do know is that the UV probably mostly is absorbed by the optic, you need glass optics for UV. (there are a few optical plastics that do transmit UV well but I’m sure a normal Carclo is not made of that).
The SRK idea will work fine, buy a cheap SRK clone, use the stock driver and tune the current by varying the thickness of the led wires, or a resistor in series with the FET on the board. Perhaps the stock configuration is just right if you are lucky. I made a 385nm beast last year, here’s the build thread: my first soup can mod: 9xLG385nm