Adam -
As you know, Colt was a member of the R&A rules committees as of 1899 and at least one other committee charged with speeding up play on TOC in 1899. (You will know more about those appointments than I.)
So Colt was around. I thought it worth noting, however, that he did not seem to be involved in either bunker project. Several non-architects were, including Argyll Robertson, Freddie Tait, Captain Burn, J.E. Laidlay and a number of others.
Bob