My idle googling suggests you are right, but is a tad above my DIY skill level.
Not impossible to rip the architrave with a hand saw. Take your time and get as close as you can, then as stevo said, caulk or fill the gap. Have you done any sawing before?
Only for minor DIY bits and pieces (and steerer tubes...), but I suppose architrave isn't super expensive, so what's the downside in trying?!
@Airhead started
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My idle googling suggests you are right, but is a tad above my DIY skill level.