Good idea in principle. But if it is only useable when the runway stop bar is lit then daylight operations wouldn't benefit. Also runway stop bars are normally uni-directional so when on the lights are only visible from the taxiway side, would this mean when vacating the runway and crossing the stop bar from the runway side that the message would be heard.
Software would need to cover both Cat 1 and Cat III stop bars if in separate locations.
Vehicle drivers wouldn't benefit unless the equipment was fitted.
When controllers select a lead-on route and suppress the stop bar for an aircraft cleared to enter the runway there is an incursion risk of a following aircraft lining up if the lead-on route is not cancelled quickly.