Pipe current buffer to external command without redrawing current screen?

I've been piping the current buffer to an external script like this:

silent! exec "silent! write! !some-script &>/dev/null &" 

And it works, but its very annoying because the status bar at the bottom of the current Vim session (I use laststatus=2) and the tildes at the bottom of the window blink everytime that is called. Is there a way to pipe the current buffer to an external command without having the screen redraw like that?

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