I have just launched a 24-bit VGA interface for 40-pin equipped RPi boards, supported by the dpi24 overlay:
https://www.lo-tech.co.uk/product/rpi-vga-board-pcb/
This board utilises the CM2009 VGA companion for ESD protection and buffering of H- and V-Sync signals, ensuring GPIOs are not over-driven. A simple ladder-type DAC is used and testing has shown a good resistance to interference from Bluetooth and WiFi on the RPi 3.

