Hello,
IP packets with TTL==1 are not forwarded. Multcast or unicast, does not matter.
You might get away with it by using L2 port-mirroring a.k.a "analyzer" feature on Your EX but the "analyzer" output port cannot participate in any VLAN so You'd need a separate port for outputting mirrored Ethernet frames into Your chosen VLAN. Basically, tis means a cable loop.
HTH
Thx
Alex