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OK...
You must have a permanent live at the switch.
Just connect a piece of twin&earth from the switch. You'll need perm live and earth.
Poke it to the fan inlet hole. Then grab your existing fan cable. You then have all that you need for the over-run add-on unit. You'll have to decide where (accessible) that you can locate this.
That should sort the over-run issue. The you have the issue of the fan extract pipe, oh yes and what you do when the fan dies.
You must have a permanent live at the switch.
Just connect a piece of twin&earth from the switch. You'll need perm live and earth.
Poke it to the fan inlet hole. Then grab your existing fan cable. You then have all that you need for the over-run add-on unit. You'll have to decide where (accessible) that you can locate this.
That should sort the over-run issue. The you have the issue of the fan extract pipe, oh yes and what you do when the fan dies.