As I am looking for something different (and better), to develop my sensitivity to different equipments, I would avoid the clones.
My initial alternative solutions are:
Buy a very good DAC (HRT Music Streamer II+ ???) and reutilize a Project HeadBox II (I already have) to amp the Grado RS1i at home; Buy Beyerdinamic T1 to use at the office with the Lehmann.
Buy Beyerdinamic T1 to use at home together with the following alternative DAC + Amp...