The TF41 version of the Spey that was in the A7E Corsair produced about 15000lb of thrust, compared to about 11000lb dry in the Spey Phantom and Buccaneer and about 21000 wet in the Phantom. So if the RN can upgrade their Speys to something similar then their Phantoms could have massive power. I wonder if the radar from the Tornado F3 could be fitted to a Phantom or could the OTL Blue Vixen be developed?
Yeah, that could work. You are thinking more like the Terminator 2020 F-4s that Turkey and Israel built, I think, and yeah you could do that.