Sweet Jesus, not this again!!!
BAe have already carried out conversions and tests on a EF, and have found out that it works. Plus, the carriers are currently in building, so don't require any expensive retrofitting - their already designed to bolt a cat and trap on anyway, if need be.
Unless you work for BAeS YD, go and take a VERY large reality pill and think about what you've just written!
Regards,
MM