Just for information to your good-self and any others looking on, I always take the tack that it is
YOUR premises and you do what you feel is right.
As you are most likely aware, some ISP's offer self-install FTTC, where it's basically plug-and-play into the existing dongle micro-filter. So, if you are not fussed (at this time) about having the SSFP installed, then stick with your current set-up ??
The only point of note is that if you get an Openreach engineer, then he/she has to perform a mandatory PQT at the NTE5. The hidden RF3 will unfortunately ensure that this test fails. So, I would inform them of this, before they head off into the sunset chasing a ghost-fault.
I have had quite a few EU's who aren't concerned about their DSL services being run over home-run parallel wiring, or they have brushed-steel socket fronts and don't want the SSFP fitting, or various other aesthetic reasons for not having us do the install to its highest standard. I always inform them of likely drops in speed, but when they've gone from low/medium ADSL speeds to medium/high VDSL speeds, they're not bothered at losing 10-20Meg.
As I say, 7LM, it's your house ...... your rules. We and the ISP can only give 'Best practice' advice.