If you have a badly butchered RFC where properly fixing it is impractical then simply dropping the OCPD to 20A is a fix.Once a Ring is Infected with numerous spurs on spurs on spurs , it can no longer be called a Ring and must be called a Spider circuit which needs to added to the 19th Edition assuming Rings aren't outlawed before that
Yes, there might be an issue of total load but unless folks rely on heaters off sockets (instead of fixed electric, or gas/ASHP sort of system) it is unlikely. I have seen 20A RFC before off rewirable fuses, I guess due to high-ish Ze at the original design time, and they worked fine for decades.