Based upon your posting I thought that you were proposing that you would pass a messenger down the mast to draw the split loom onto the groove for the boltrope. Although I have not done this, based upon some testing in my basement I think this feasible. The inherent clamping force of the loom is not great but I think that it'll be adequate to keep the loom in place.
I pulled my stick and I think that I'll try installing the loom before launching in the Spring. If I do so, I'll post the results here.
