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I reckon you'll be alright but I don't really fully understand MVHR or fully understand all the Changeplan/Ubakus etc. wizardry - I'm getting my head around it at the moment. Although someone on Buildhub said Changeplan puts the dew point in the insulation with IWI even if you spec 5mm of insulation, so hopefully you've got figures from Ubakus/somewhere else too.
There's only so much I can do right now before the point above about planning and EWI is resolved.
Fox
The PIR will be adhered to the masonry with a foam seal around the perimeter of each board, along with a coat of liquid airtightness membrane. As you mentioned, continuous MVHR ventilation with auto-humidistat will be controlling humidity levels also.
The external brickwork will be properly re-pointed with lime mortar, and the walls in question are south-facing, so very unlikely to ever soak through (they haven’t in the 8 years I’ve been in the house).