Those phones may not be very loud with the amPlug, but it should work. My fits-in-the-bass-case practice set-up is an amPlug plus a decent pair of JVC earbuds, and that works fine. The tone of the bass amPlug is nothing to write home about, but I can hear my playing clearly enough and get a mix with practice tracks from my mp3 player/phone, and that's enough to keep my chops up on the road.
'berger XL-2 => EBS HD350 => EBS Neo212
Steinberger Club #0013, Pedulla Club #147, Pre-EB MM Club #44 , Epiphone #90, EBS #34