I got 99 problems but my WiFi ain't one

Ok so I came here to verify the plan of attack I had reached to solve my wifi issue to only find that I may not have started down the right road. So looking for some advise please.

My issue is that in the house my virgin wifi is spot on. Does everything I need with wired connections, NAS and wifi. Most of my hardware is used in the same room and on the same floor. However - I have a bar/garden room that cant pick up the signal from the wifi and I want to use my internet radio that also picks up music from my NAS plus usual video streaming with laptop.

When I was using the BT line the access point is at the front of the house but the middle of the property (and worked fine) now we are with Virgin the access point is at the rear of the house and as far away from the bar as possible. I dont want to move the fibre points as the virgin one is next to my entertainment stuff and works a treat. Using the BT line was always a compromise in every other way other than wifi.

So to solve it:

Firstly powerlines do not work in my house.

All internet hardware is in an inbuilt cupboard so is invisible and child friendly but means I can't run any cables out of the room that it is in. I know the router being in the cupboard is hurting my signal but taking it out would mean 6 cables having to go back into the cupboard to my PC, NAS, TV box, and fibre point. This would ruin my sweet cable setup.

So what I thought would be the best plan would be to buy a wifi mesh AP like this netgear (or lower spec but same sort of thing) -

https://www.amazon.co.uk/dp/B07HM6WHYZ/?coliid=I1D7GSDZ71W5PC&colid=2MOJSAZD64ZR4&psc=1&ref_=lv_ov_lig_dp_it

And then place that where my AP would be like when I was with BT to punch the signal out of the house and to the corner of the property. This seemed like the most logical approach to me as a lay person and I bought the marketing hype around this triband stuff. I can set it up with WPS and if my router ever changes all my other gear is unaffected and seemed great...

Untill I came here and found out that wifi extenders are shit :-D

Before this conclusion I thought about changing the router to a third party one with more punch to see if I can get a better signal that would reach further inspite of the restrictions I have placed on it with my cupboard. This option seemed like potentially an expensive risk. My research also showed this to contain the most headaches around compatibility with ISP gear.

Since reading this thread I have thought that an alternative could be to get one of these Ubiquiti AP lites, hope that it has a further range than my virgin hub 3.0? and put that on the outside of the cupboard but in effectively the same place like a router antenna in the hope that the more efficient signal path would be enough to get the signal in the bar.(I would then use this for all wifi in the house)

To show what i'm working with in regards to signal strength I have a load of screenshots taken from my old macbook that would be used for streaming in the bar.

Sitting on sofa in same room benchmark :

Sat in front of cupboard with door closed, where the wired AP would be:

Inside cupboard next to router:

Where the wifi extender would sit if went that route:

Outside the house near the wifi extender location:

In the bar. You can see the low signal as it then drops connection:

Any advice is greatly appreciated. Was hoping to have this all fixed for £100. I dont want to go to crazy as I had originally expected to use an old router with power line adapter that I already have but as mentioned above they dont work with my wiring and really really dont like the bar being behind a second fusebox.

Sorry in advance if this doesn't make much sense