It depends upon how you define "nigh-unrecognizable".
LNC and PGL could both be made into tanks without *too* much mangling. Remove the positional requirements (and likely fold in the benefits as baseline effects), add some high enmity modifiers in their place, and they could be turned into tanks pretty effectively: they don't have too much in the way of DPS CDs (PGL just has Internal Release; LNC has B4B and Life Surge). MRD could be turned into a DPS without much, though its CD suite *is* a bit strong after the 2.1 buffs.
