After a little advice please.

I'm slowly upgrading my networking equipment at home.  Yesterday my shiny new USG arrived and, after some initial hair-pulling (turns out it can only be adopted if the controller is on 192.168.1.X, which mine wasn't) I've got it connected and have internet throughout the house.

As a way of explanation, the following is how I have things set up:

ETP --> V130 --> USG --> un-managed switch --> rest of house (RPi running Unifi controller, 2 Unifi AP's etc)

The V130 is in bridge mode, ADSL2/2+, @192.168.1.2 and the USG is doing the work @192.168.1.1. I would like to be able to access the V130 from within the LAN without removing cables etc to do so - I realise that it will be a rare thing that I need to get into it, but still.  I have read some stuff about VLan tagging but it all seemed to apply to VDSL as opposed to ADSL, so left me a little confused.

Any advice would be greatly appreciated, thanks.