Template BLF Variables

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I am using FreePBX and over 300 T54W Phones.
I am creating templates for departments with calling queues. The departments need buttons for joining and pausing the queues.

Currently in the phone I have to enter this value i to get a working BLF Key.

*45xxxx*qqq (x=extension q=queue)

Is there a variable for the extension that I can use in a template so that I do not have to do this in every individual phone?

I have seen other phones that use this type of variable *45__line1ext__qqq and when the template is pushed out it automatically adds the extension number for each phone.

Thank you,