Yes, many Thelemites who are also members of the EGC will take communion in the gnostic mass.
Amongst other things which occur in the ritual. The actual consumption of the communion means the same thing to them as a christian the ingestion of a physical thing infused with energy of the divine....just in this case not God/Jesus.
There is also the Mass of the phoenix which a solitary Thelemite (or anyone) can perform. Again the above applies.