I think a lot of top specialist functions are too much for a single country to maintain.
I thought for a long time if the NATO AEW force was a good model to expand.
Now we have a small scale but cross nation tanker force and a C-17 heavy lift capability - what else could go this way.
P-8 ops? Even C-130s - You could imagine Netherlands/Belgium/Denmark/Norway pooling together- with much benefit.
If each Typhoon country went for the SEAD version It would be a good idea to base them all at Leeming to use Spade but set up like TTTE at Cottesmore