Finally downloaded the article and read it. Relatively high level and, with all due respect to the authors, not all that compellingly argued.
I would have thought that any increase would be in the Beersheba brigades themselves? Otherwise potentially in combat support and combat service support to bring them up to a level so that the Beersheba concept is fully supported.
e.g. Adding a third cavalry squadron, a second or third tank squadron, an additional mechanised battlion to each brigade. Or, alternatively, adding a third air defence battery, beefing up logistics support for each brigade, etc etc.
The brigades do the land element force generation. IMHO any expansion of the Army would be about expanding the resources the brigades have to draw on to generate that force.
The whole concept of a "two ocean army" feels like a diversion. The army is the army, and it can be moved to the ocean it is needed at.
Regards,
Massive