NO. Pure and Simple.
You cannot do anything to the wires before the master - that is BT Openreach's property and you are not permitted to do anything to it.
As there are no phones, a filter is not needed so revert the front plate to and use a BT 431A to RJ converter.
Not in all cases, we had our NTE5A Master socked taken out by a bad thunder storm above our house, that killed our actual phone and modem/router that was connected to the line at the time, it wasn't the lightning that did it but more the static discharge.
Had to phone BT to report this as a fault and was told its an internal fault in our house and that we would be charged £130 (I think it was that amount) so thinking sod that so I ended up buying my own NTE5A Master Socket along with the BT Faceplate and dsl filter and fitted it myself, so in my eyes they are mine and not BTORs property, every engineer visit we have had since I have told them the same and showed them the chard broken one and they said fine.
Granted the BT80 and the cables from it to "our" master socket is their responsibility, so I also say no.