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hinges usually have some degree of restriction on them anyway, but not sure if this could be adjusted down to only open, say, 3" without pressing the release catch.
"normal" friction stays open between 70ish degrees for 8 inch sizes down to 45ish degrees for 24" size. The sash travels towards the middle of the opening, so not great for climbing out of.
Egress hinges are side hung and allow 90deg opening across to one side.
Easy clean is a button to unlock the egress hinge so it can be slid across for cleaning.
Restricted is a button to unlock the slider beyond the initial openingI don't think there's restricted easy clean.
https://store.northwesthardware.co.uk/windows/friction-stays/restrictor-egress-stay.html
Why have two hinge pins when you can have 16 rivets two sliders and a sprung catch!
user69121-
Well that's a bummer to hear, as 'egress/easy clean' seemed to solve a few issues, but cleaning could probably be done from the ground I suppose.
The cill is very low 400mm-ish and tilt & turn always opens inwards doesn't it? I feel it's going to impinge on the room and possible furniture layout if so. The current window is top hung which doesn't really seem to make the most of the window either, being that there's a roof directly below, the window doesn't really feel open even when it is.
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Also, sounds like you're qualified to answer, is it possible to do 1m x 1.6 in one pane? One company I spoke to said no, but that might just be them being a bit shit.
Polygon
That'd look nice but I don't think any of them would end up big enough to crawl out of in the event of a fire. Having actually done a Google I think I'll probably go for a big side guided with a fixed or top hinged top. The side guided (as opposed to hinged) will allow for cleaning. I'm assuming there exists some mechanism to stop a toddler opening up a window wide enough to crawl out of.
Edit: I know sliding UPVC hinges usually have some degree of restriction on them anyway, but not sure if this could be adjusted down to only open, say, 3" without pressing the release catch.