There is no limit to the number of sockets that can safely be installed in a ring final circuit, if done correctly.
The floor area circuit limits in BS7671 are historical and based on electric heating, however they are there, so to install a single circuit in an area exceeding those would be a departure from BS7671 this would require documenting on the certification.
Whilst the location may not be a workplace, it is likely insured, and insurance requirements will almost certainly require compliance with building regulations, which require compliance with BS7671 for all electrical works, if one follows the guidance published. If one doe wot then t would be down to you to be able to justify that what you have done is as safe or safer, or compliant with the intent of the law. (EAWR will apply if you pay for work, on the person doing the work regardless of the location of the work.)
That said, it is unlikely an issue would arise. However, insurance companies are now tightening up their claims procedures.
Just be sure what is done is safe, and in the event of an issue you can prove this, then crack on.
On a technical point, please realise that a BS1363 double socket outlet, even though it can be legitimately fed by a 32A circuit and it can have two plugs with 13A fuses fitted to them, it is not rated to 32A, nor even 26A. They are rated at 20A, 13A & 6A with 1A “headroom”.
Cheap sockets will often not carry the current of large loads safely for long periods, hence why, electric vehicles should not be charged from just any 13A socket outlet. Additionally the durability of the contacts and switching mechanisms are often inadequate for high load, & frequent use, or a combination thereof.
So, just be mindful of the loads, and the expected use of the sockets when you select the makes. MK are not what they used to be unfortunately…