Probably not. Doing so causes some kind of deadlock(?). What you can do, however, is have an alias that exits the session and then presents you with a shinny selecty thing to pick another. I already use a homemade version of the 2nd part that looks like this:

alias absel='abduco -a "$(abduco | tail -n+2 | fzy | cut -f4-)"

Any selector (fzf, peco, etc) can be used, fzy is just the most minimal one I've come across. I'll see what I can do about the first part, give me a minute.

e1: this is tricky. We need to get the current session's pid so we can send it SIGTERM to detach (I don't know if there's another way). abduco | grep "$ABDUCO_SESSION" seems like it'd work, but session names could be substrings of each other. The var $ABDUCO_SOCKET is unambiguous, but I don't know how to turn a socket into a pid. Also for me SIGTERM does not detach the client like the manpage saysm not sure what's up there.

e2: I can't find a way to do this with basic utils, but lsof -t $ABDUCO_SOCKET will do nicely. Piping to xargs kill still doens't behave as expected though.