Can I send Lem and Mina on the Sidereal without going?

I started playing with the intention of my character wanting to just try to live a normal life despite being a sleeper. Now I realize I can try doing more by helping the refugees (currently have Esher arrested and I honestly don't care about her but I want to try to fix the whole refugee fiasco she caused) and the community of Greenway. I still want the chance to send Lem and Mina in the Sidereal, but I don't want to go with them. Is it possible?