Before construct switched to system generated spritesheet/texture atlas style, you could easily swap stuff out on the server itself.
I'm not sure if there's an option to revert back to how it worked before, as the output now would be rather difficult to update, because of the way the images are organised.
In my follow the leader game - I had a blue barrier thing that's 16 frames long, my original spite strip is 1x16, but when saved out and published, ends up as two .png files, one for the first 9 frames, another for the second 7 frames, both in 3x3 grids.
It's not impossible though - just depends on how complex the game is - if there's not much in the way of frame-based animation going on, then it's feasible.