Is there a way to run multiple instances of corosync on the same host?

I'm developing several applications which use various features of
corosync (cpg, quorum, votequorum, & cmap), and I need to test the
behaviour when nodes join and leave the cluster. Currently I'm using
vagrant VMs, but this is cumbersome and slow. Ideally I'd like to launch
multiple corosync processes, and then do things like shutting them down,
using iptables to interrupt communication, etc, to test the various
scenarios. But it appears the libs use shared memory for communication,
and because of that, I don't know if running multiple instances on one
host is even possible.

Thanks

-Patrick
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