Found an Acer EasyStore H340 for €25, upgraded it to a newer motherboard and patched all proprietary motherboard connections: Cheap homelab! : r/homelab
VGA Adapter for Acer Aspire easyStore H340 H341 H342 and Lenovo IdeaCentre D400 | eBay
Truento VGA Adapter Connection Cable for Acer Aspire easyStore H340, H341 and H342: Amazon.de: Computer & Accessories
HP MediaSmart VGA/PS2/Serial Debug Board
Adding VGA to easyStore h340 Home Server – kamlau.com