I am upgrading from fibre to the exchange to full fibre will i still becable to ise my 1 plus year olf deco x73 dsl based system and will i have to change any settings. My isp is plusnet

I have a deco mesh system deco c73 dsl and a oair of x20s and I would like to connect an tp link ac750 extender to it i dont mind having a separate ssid. can this be done and if so how