What martial art should I learn?

[Satyadhi]

Ok, I want to one day create my own martial art called Yudharmyapatha (it's loosely based off of sanskrit and means the way of just or righteous fighting.
In order to create a martial art I plan to spend years studying as many other martial arts as I can, to the point that I probably won't get around to startingmy own martial art until I'm about 60 or something like that with over 30 years of experiance. The question I have is what martial arts would be best for me to study, of course that's a personal choice but, let me give an outline of what I already know I want to learn.
Let's say I've been practicing Daito-Ryu Aiki-jujutsu as well as tai chi, and chin na and dim mak for many years as my main martial arts though I also have extensive knowledge of many other styles of jujutsu and aikido and baguaxhang and yingiquan, the main weapons my own martial art i wish to create one day mainly focuses on are various swords and knives (especially kirpan), and sticks of various sizes and the fighting sash sometimes also called the fighting sarong.

What martial art would be best if I wanted to better balance my martial arts skills? Preferably a more external art with some internal qualities, an art that could take a lifetime to master, and could be practiced effectively well into old age. Focusing more on striking than grappling but with an element of grappling nonetheless. I'd also like it to focus on chin na type techniques. any suggestions?

[Satyadhi]

Let's simplify my previous post. If I wanted to create a new martial art do you think a mix of jujutsu, silat, and internal martial arts would form a strong basis, if not what should I add or take away in order to strengthen my martial art, you must also consider that I plan to study as many martial arts as possible but I need to focus on mastering a few.

[reviewer]

I'm not sure what area you're in, but I would imagine the limiting factor would be the dojos/schools in your area. I would much rather pick the dojo than pick the art - meet the trainers/senseis, see which seem knowledgeable and good teachers, for example.

[MartialArtGuru]

Have you tried the Systema Russian Martial Art style by Vladimir Vasiliev, it seems like it would fit with what you are looking for

[sirdarksol]

I was unaware that Systema drew from chin na (which Satyadhi said was an important aspect). Please elaborate on the history of that connection. Even with arts that I will probably never study, I love learning about the interconnections of the various arts.