I had a thought this morning: swap the Chelsea and Soho lounges. The F&B issue can be fixed in any location (they both have kitchens). Make the First/GGL experience in the spacious room as it once was. Soho users would love the décor of Chelsea and Chelsea users get the space and views of Soho.
The First lounge in T5 LHR is packed so why not fully pack out the current Chelsea as the new Soho?
The current Soho is a few tweaks away from the old JFK CCR and none of this would cost much.