Help Utilizing GPU through iGPU

[NeRLeY]

My 3 years old monitor finally gave out and the only replacement I have at this time is a VGA monitor without any other connectivity other than VGA. My Power Color RX 570 only have a DVI-D and I do not have access to any adaptor/converter. My motherboard though has a VGA and with iGPU (onboard) I can access Windows, I just cant play games. Windows is recognizing that my RX 570 is installed and I just want to know if there's a way for me to play games (esports games mainly) and utilize the RX 570 through the iGPU. I recently watched LTT's video about gaming on mining cards and maybe I can do the same with this RX 570. I tried setting up in  Windows settings / graphic settings where you manually add a game and choose performance settings, Windows sees and chooses my RX 570 when I choose the high performance option but I still get an error when I tried to play games like Dota 2 or CSGO.