Are you leaving the headstock that shape?
If not it may be best to cut & shape it now if you plan to have a uniform stain colour all over.
On my 5th build (link in signature below) I did the chemical wash stain method you described above and it will need some top coat otherwise parts will gradually wipe off over time through natural wear & tear. If buffed straight up it will disappear before your eyes in no time at all. I used lots & lots of Tru Oil but any type of top coat should do equally as good a job to help you achieve a shiny finish.
Cheers, Waz
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