I mean I assume it would be possible, but it would largely depend on where they are with construction at that point. My guess is that they'll likely move the portals and we'll have to walk further (coming from someone with no inside info)
@thelondonwerecat - I can't quote your post on an edit, but KidZone closes in January so I'm thinking construction will be in full swing by next September! I think they could keep one entrance in that area and just use the ET queue, but the other portal would either be in Springfield or near La Bamba.
I'd assume they don't want to remove a zone. Imagine how pissed the general public/most of the fandom would be. It'd be a very "Disney" move imo
And as far as FNAF, a similar style to Dead Exposure would work really well I think. They could use deep hallways similar to what they use for bungee scares, just with animatronics at the end of the hallway staring. False jump scares such as a phone ringing or an arcade game kicking on could really build tension as well. Could be a good way to get around lack of scare actors!