I would go for EVPN-VXLAN for this solution - but I would suggest an upgrade to 17.3R3 before looking into this option as I don't see it as mature feature in the 14.1X53 release.
Please note: Both the l2circuit and EVPN approach will require the QFX-JSL-EDGE-ADV1 present on the device to be compliant. I don't know if this is the case, just wanted to ensure it didn't come as a surprise.
-- Best regards,
Jonas Hauge Klingenberg Systems Engineer, SEC DATACOM A/S (Denmark)