I don't use my lines for voice, so my setup is a bit different to yours, but yes, by "hard-wired", I mean wired internally inside the socket.
On the back of the standard (voice-only) detachable front-plate on my NTE5A, there are 3 IDC terminals. I took one pair of wires from a CAT5 cable, and terminated them onto the A and B terminals. (I have two lines, so did the same with the other NTE5A, using another pair of wires from the same CAT5).
My understanding is that on your socket with the VDSL faceplate, you should have two sets of IDC terminals - one for data (on the back of the VDSL part of the socket), and one for voice (on the original voice-only faceplate). So you could then use one pair in the CAT5 to carry the VDSL as a "data-only extension", and then another pair (or a pair and half) to carry the voice.
If I'm understanding things correctly, you would then not need any filters on the voice part of your network.
It also depends on your cat5 cable - is this just a long patch cable you bought pre-terminated? If so, it may be stranded cable, and not suitable for the IDC terminals.
Also, just in case you haven't seen it, here's my recent story about rewiring my master sockets:
https://forum.kitz.co.uk/index.php/topic,21450.0.html