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That should work fine.@Avo Mk8 following your comment, I revisited the drawing, and I think this is how I could maintain the first switch being a 2-gang as you say, but making the internal lights 2-way.
The first switch is the 2-way internal light setup.
The second switch is the PIR, and if wired correctly at the other end, should provide PIR mode or manual override of the external light, as the black wire provides the permanent live, and the brown wire is the switched "manual on" live.
View attachment 89143
There's quite a lot of wires to deal with - if the patress is not a deep one, you might be better off with your original idea of twin boxes.
If you are familiar with Wago connectors you might find they help.