Don't know if this will work but...from the help files;
To program an analog device to hotline to an external number:
1.Program an exact ARS route to the external number (for example: 901291436888 with 0 digits to follow).
2.Program a speedcall to the external number (for example: speedcall 4000 to 901291436888).
3.In the associated directory number form program the extension number to hotline to the speedcall. For example directory number 2232, Associated Type - Hotline, Associated Number 4000 (speedcall to the external number).
So if you do step 1 as just a 9 and use a digit mod that doesn't strip any numbers and then program the speedcall as 9 do the rest it may work. I have never tried it BTW so...