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I understand what you're getting at in terms of preventing water ingress, I think this is what you're suggesting? I insert some DPM under the exterior sill and sandwich it between the frame and worktop to capture any moisture that gets under the window frame/exterior sill?
@user69121 that's a really useful bit of info. I'm unsure what the current interior window sill is sitting on in terms of brick/block. I guess your point about looking more untidy is fixing the gap between left by the protruding lip of the exterior sill profile?
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hamrack
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Spot on.
Its a common problem I come across at work especially with modern level access bi-fold door setups that are oh so popular these days.
Roger Bisbee explains it much better in this video (from about 0:30 - 3:00) than I can by tapping away on my phone you'll be applying it to a different issue but the principles are the same.
Bobbo
From your pictures you have enough wiggle room to play with the reveal on the inside. Buuuuuuuuut (and it's a big but) you need to be careful in doing it, ideally when the opening is formed there is a slight fall on those bricks. That way any water getting in will hit it and make its way back outside. If you're going to play with levels inside I would strongly advise putting a dpm at the bottom of the opening (where it currently is), this should fold up along the inside surface of the window and finish just below the top of the worksurface to force any water ingress back outside. If you don't do this you run the risk of inviting damp in and you'll know fuck all about it until its way too late.
EDIT if that makes no sense let me know and I'll upload a sketch which should be easier to understand.