Clearly the bunkering needs work, but defining an appropriate bunker style for a Fowler course is not straightforward. Of all the Golden Age designers he seems to have been least tied to any kind of signature visual approach. Contrast Walton Heath, where he basically just dug down below grade with the Berkshire, where he built some very large and complex-shaped bunkers. (We can speculate on Simpson's influence on his older partner at the Berkshire, but former club secretary Peter Foord researched the construction of the courses very thoroughly, which was possible as it was a Crown Lands, essentially a government-backed, venture and the paperwork survives, and there is _not a single reference_ to Simpson being on site at all during the build). It would be _highly inappropriate_ just to rebuild BD with en vogue quasi lacy edged bunkers.
Derek Markham's biography of Fowler is due out soon, and we can only hope that will fill in some of the gaps in our understanding of his design thinking. Meanwhile if it were down to me, I'd suggest that the club defers consideration of bunkering for now, concentrating attention on fixing the tree and grassing lines issues, which to be frank are both more important and more pressing. Meanwhile, they need to assemble as much historical material as they can to help them make the most informed decision possible when the time to fix the bunkers comes round.