Do a search for daisho sabaki or jutaijutsu. There are several variations of grappling WITH the sword or both swords. I believe most are being taught in Bujinkan ninjutsu, depending one who your instructor is. This might be a very viable alternative for you. There are several Bujinkan dojos around and they teach what may be the closest to the samurai arts you will find in one school. They cover all ranges of ground fighting, joint locks, throws, striking and weapons. The sword arts of the Bujinkan is on par with any other school i've seen.
Don't think of ninjutsu as the ninja stuff you see in the movies. It is a very effective art and grounded in principles that work.