Well, there exist rack consoles for datacenter use which can be found used on eBay. However, you might need a video converter since they are VGA only; rackmoun

Well, there exist rack consoles for datacenter use which can be found used on eBay. However, you might need a video converter since they are VGA only; rackmount servers only have VGA video outputs. The least expensive option would be to buy a second small monitor.