Creative
I just finished a handrail job where ear had to switch a painted oak rail for a stained rail. We used rail bolts which leave a 1" plug hole under the rail. It's pretty easy to do and get a tight and strong connection. I just bought the 700 connector set and played around with a scrap piece of rail and a piece of plywood that represented
a newel post. It works but it leaves a 14mm domino size hole under the rail that you would have to plug. It would be a little tricky to try to grain match the homemade plug with the rail especially if stain grade. Also the 14mm domino connection was on the lower third of a the rail and although it made a tight joint when you pull back on it as you go up I was able to get the top to pull away from the newel post. You could add a screw from the top and plug and that would make for a long lasting joint. It would be nice if the connector was longer so you had more of a chance to move the slot closer to the middle of the rail. The rail I was working on was a 44 degree angle which was steep and limited my options. Just make your you have plenty of scrap to practice on and take copious notes because there is a lot of fence, height, and angle adjustments that have to be made!
Cheers
Curt