I’m sorry, I don’t have access for the international shipping. I hope there’s a member here that would build you the flashlight, especially near you nor at least still in the same country.
Quad 219B would indeed be awesome
negev, I am not sure if he can do it, if he is available or willing to put that light together for you, but try to reach member G0OSE (https://budgetlightforum.com/user/12792), as I’ve seen some stuff he modded and it looks good.
And he is in the UK.
I just built S21A quad with 4500K 219b’s. With Kaidomain quad TIR and pcb it needed about 6mm high and 22mm wide flat spacer. Because its flat, it is easy to make yourself. If you have round stock aluminium or copper, you only need saw. Kaidomain TIR was perfect match to S21A. I used Led4Power 12 A driver.
Cheers, I sold him a couple of batteries a while back, have sent a PM 
Whereabouts in London are you? I might be able to help if G0OSE doesn’t fancy it. PM me if interested