If theres a market someone can make it happen.
They have announced a handheld gas chromatography lab testing 
{LINK REMOVED} device that will detect diketones it  is now crowdsourcing.
It will use an app with a remote specimen collection device..
I cannot find it but its out there looking for sponsors..  I read about it on FB a while back and cannot find the post.  It will use a remote sample collection device and an app in your cell phone and supposedly will measure ppm/b..
  They already have one made for detecting bad produce, meats,  the strain and strength of 
{OTHER STUFF} for medical users.
This will be a win-win for two communities beer making  and vapers..
There's so much confusion about the measurement of diketones --
yes diketones can be measured in ppb but the start up cost of that equipment is 50k.  It actually measures in real-time.  
Real-time measurement of diacetyl in beer
Hopefully this app comes to fruition..