Just a quick introduction to the main question.
1) After looking at some pics of what appears to be genuine periscope views like
I noticed there is no bearing scale on this.
2) There would be a bearing scale on the scope but the captain would have to look up for it.
3) The attack scope in the tower has 2 views. 1st is a general overview, 2nd is looking through the scope.
4) Although the attack scope is in the conning tower, the only exit after viewing it that I have found would be to the command room, not the tower.
The Question:
Is it possible to mod this so that you look through the scope with NO bearing dial, right clicking would take you first back to the general overview WITH a bearing dial, a second right click would take you back to the tower?