A QFP is relatively straightforward to hand-solder so it’s likely ... sandwich bridging the two. A lower PCB is made of thick material and mirrors the QFN footprint above the level of the ...

This was also how the original modification by [Tomasz Mloduchowski] worked, only now it comes in a handy (OSHPark) PCB format. After removing the VL805 QFN package and soldering in the bridge PCB ...