Sleeper agents should be reliable enough, considered that they (the in the long past &quot;recruited&quot;) want to have their family and loved ones safe -- it would really be a pity if some stupid accident happened to any of them on their way home...
Sounds morbid, yes, but rest assured, with enough &quot;motivation&quot; financial options and &quot;moral flexibility&quot; you can always motivate others, to do as demanded.