I guess I am puzzled as to why you are carrying the swordsman into the modern era at all. The Spanish reintroduced the sword and buckler men to deal with the problem of the Swiss pike phalanx. However, they proved highly vulnerable to any form of good cavalry, and switched to a combination of pikes and arquebuses to allow them to resist cavalry and still have a chance against the Swiss. The whole issue is covered pretty thoroughly in Oman's Art of Warfare in the Sixthteenth Century, including a detailed discussion of the composition of the Spanish Tercios. The Roman legions were shattered at Adrianople by the Gothic heavy cavalry charging with the lance. Once the bayonet was introduced to keep the cavalry off of the infantry, the pikes disappeared pretty quickly. An obsolete unit is dead meat to a sufficiently advanced unit. Swordsmen and pikemen are dependent for their effectiveness on the mutual support of dense formations. A dense formation is the dream target for modern weaponry, especially artillery and machine guns. Give me a .50 caliber machine gun and plenty of ammunition, and I will turn a Roman legion cohort into neat rows of dead bodies in very short order. Do a little research on what happened to the British on the first day of the WW1 attack on the Somme, where they took nearly 60,000 casualties on the first day, most of them before noon, when they attacked in lovely parade ground lines. A legionaire or pikeman was in a much tighter formation.
That is sort of like giving a Greek bireme a chance of sinking an Iowa-class battleship. It just is not going to happen.