I have an existing .bat file which uses the start command to launch multiple tasks, e.g.:
start cmd.exe /k "echo task 1"
start cmd.exe /k "echo task 2"
start cmd.exe /k "echo task 3"
What happens is that ConEmu attaches only to the cmd.exe executing the .bat file, other cmd.exe instances start off as stand-alone windows:

I want the standalone started windows to be attached to ConEmu. I'm aware that I can achieve it by modifying the batch script, but I don't want to do that because the script is shared with other people that don't necessarily use ConEmu.