I would stick to the main idea , 6* xp-l or 6*sst-40 (even better) on a copper DTP mcpcb with a quality boost? driver , or even a simple fet driver .
I would really like to see springs bypassed on this production light , Q8 proved that bypasses are a must . Second thing is brass screws holding the springs pcb , really makes a difference (3rd photo of Tom E’s post here) .
I would be interested in testing and writing a review too , thanks !