You would need a spare phone or use a kitchen or computer room phone that does not have a mailbox behind it or any lines told to ring at it...
Overflow the hunt group to that phone after 15 seconds
Forward the phone to your mobile.
For external forward:
Allow Redirect for that set
Make sure lines are in a Pool (if they are POTs/Copper) such as Pool A
Setup a separate Route (such as 007) to dial your mobile # and tell it to use the Pool A (or BlockA for PRI)
Setup a Dest code such as 7
Have Dest 7 code use Route 007
To External Forward from that set just do
Feature 4 7 OK
Another method would be to use Answer DN keys on all sets including that spare instead of Hunt Groups and program the mobile number into the Call Forward No Answer field on that spare set.
You would need to make sure no lines are assigned to that set since all calls will forward based on timer.
Hunt Groups ignore CFNA settings.
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