ed777 … you are looking for a virtual-keyboard that offers a feature for input-delay … think i have found something which might appease you … it's called "hot-virtual-keyboard".
their online help-page offers a plethora of tweaking for the utility … simply utilizing a filter-word "delay" in your browser's
'find' feature, that specific page comes up with thirteen hits … veritably, a few sounding quite similar to what you hope to achieve.
however … they are also open to user requests,
ed777 … so, have a go at the website … see if the product has what it takes to romance you.
Hot Virtual Keyboard - Virtual On-Screen Keyboard for...