In Bambu studio you can change the print sequence of inner wall/outer wall/infill.
But it will print all of these walls/infills for each segment, for example the column between the two openings in the picture.
Process - Advanced switched on
Quality Tab /Advanced/ - Order of Inner Wall / Outer Wall / Infill Dropdown box The option you want is there as infill first
Not that I am aware of. Someone with more experience may know. I don’t think you need that much cooling time before the walls, if anything turn up the aux part cooling fan past 70%