Willem,
I don't think the "nose job" is newer.
The other resemblance with a Tajong/Coteng, and difference to a Jawa Demam, I tried to illustrate is the position of the limbs. If you look at the Jawa Demam it has the "fever blanket" position with a diagonal arm (see ref. pict. below). This Gayo, as well as the Tajong/Coteng has a more bird like position of the limbs. But it's neither the same as the sitting position of the Burung, pure bird hilt with one hand up and the other down (see other ref. pict.). Hopefully these pictures will illustrate what I wanted to highlight.
Michael
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