Thats why I say outsource.
If they outsource their latest stable, when the tile editor is deemed ready, ;) then outsource that 1 version to a company who has had experience in these kinds of projects.
It will be done correctly in one go and they can aim to support that one version till a better solution may be provided.
Having it outsourced by experienced mac os developers will reward itself greatly in costly time ... which I see scirra development team has their hands full with already.
Others might see Construct 2 as a more potential development platform for Ios related material then for example ios's xcode ;) (ever tried that hehe)
lots of potential, seriously worth it