There was a Saxon coin - sceata; it has the wrong pronounciation, but could possible evolve into sketch??

On hautboy - was the sense definitely musical Steve? OED gives other meanings as lofty trees as opposed to shrubs- 1700, the strawberry - 1731. OED gives oboe=hautboy as 1794 (but an oboe organ stop from 1700). I don't know offhand how long hautboy persisted (woodwind not really my thing), but could do some digging.

Mick