(a) feasible at all, and
(b) would make the watch less wearable.
With all the enthusiasm for this watch project, let us not forget that we are not involved in making a recreation of the original B-Uhr (especially as the 55mm Laco replica is available). We are making a budget-oriented special edition making use of existing parts, with a stripped automatic movement that is nowhere near the original movement of the watch, a special caseback etc.
Personally, I think the question of a "FL 23883" on the side of the case at 9 o'clock would contribute much more to the watch, and the special edition, than a stem crown.