The only way I've found to get Lanius crew so far is to start with their ship, but if I'm not using a Lanius ship, is there a way for me to get more crew members?
Yes there is at least one random event that results in getting a Lanius crew member, even if you aren't piloting their vessel.
Having searched the database for the "Lanius" keyword, I found that there doesn't seem to be any events that guarantee a Lanius crew memeber; however, I believe that any event that gives a crew member of a random race may yield a Lanius crew member.
This has happened to me once thus far in my playthroughs of FTL:AE
Once being in the
Abandoned Sector (which acts as a Lanius Homeworlds) you can obtain a Lanius crewmember from events that result in giving you a crewmember (random) or hire them from the shops.
It is possible to hire Lanius crew from stores in the Abandoned Sectors. I don't have proof now, but about three playthroughs ago, it happened to me.
i just got one from quest.I chose 3rd option where you askt hem about their translation device -> they give you lanius named "translator"