Im certain that it would be a much easier and cheaper change to adjust or make new neck templates to alter the shape of the headstock than get a new custom-made truss rod cover tooled up by another factory in order to get one with a custom angled end. These kits are kept low cost by the ability supply parts that are mass-produced by other factories in large quantities.

Personally, I’d much prefer to see the bigger issues dealt with first, like the dodgy neck pickup routing and the lack of adjustment of the bridge making intonation of the low strings almost impossible (from the build diaries I’ve read). Then deal with the looks.