How does this work in the context of a pipeline?

Is your pipeline from functions / decorators ? or is it from Tasks ?
(if this is Tasks then just changing the entry point in the overides)
In case of functions or decorators, you have to do that manually (i.e. your function needs to do "accelerate launch"

from accelerate.commands.launch import launch_command, launch_command_parser
parser = launch_command_parser()
args = parser.parse_args("-command -here".split())
launch_command(args)