Help With Hints

I have a question about hints…

We have several contexts specified in extensions.conf. All the extensions are 5 digits in length. I have three in particular that contain ~ 50 users each and the their extensions vary so that I cannot use the wild card _45XXX or _37xxx

exten => _45xxx, hint, sip/${EXTEN}
or
exten => _37xxx, hint, sip/${EXTEN}

is there a way to use the hints by way of the context in extensions for example

[ABC]
exten => _xxxxx, hint, sip/${EXTEN}

and then extensions

[DEF]

exten => _xxxxx, hint, sip/${EXTEN}

and then extensions

and so on…

instead of every entry having a hint like:

exten => 11111,hint,sip/${EXTEN}
exten => 11111,1,Dial(Sip/${EXTEN})

Thanks,
Tom