We'd have to see your suggestion, but this is a variation on either the eyepiece extender or (for those that remember) the top viewfinder the old Canon F1 and Nikon F used to have (you could swap the prisms!)
Of course, if your not making maximal contact with the camera (including your nose!) its may not be as stable to hold - which is one of the reasons a lot of people move away from P&S or buy tripods
Seriously though, I'm not really sure of the benefit in a
nose space as the chassis manufacture would become more complex (odd shapes), and potentially less rigid (a box or sphere is structurally stronger in general) as well as complicating light paths (like the AF).
So if you've got a thumbnail sketch lets have a look - and make sure you CC it to Pentax so you can claim the intellectual property if they follow through!