Hi. A couple things:
The underlying intent for the removeable string tut was to DIY-mount the connector hardware with (relatively) easy to find parts. But you can certainly replace the jack and plug with Multi-pin plugs, DIN plugs, etc. SlothNorris has some good ones, so does Erv. The only stipulation is that it should have at least 7 pins. One for each positive segment and the one negative
The Hyperdyne drivers are designed to use 11.1V and drive the 150-LED Hyperblades - WAY more than the DIY strings.
The newer Hasbro boards are different and have a different scrolling effect. For example, the Kit Fisto fades on segment 1, and scrolls slower. Also, they have the "kill" function which disables the activation when disconnected, so you'll have to MacGuy-fu a workaround.
I haven't used Hasbro boards in years, but they used to get fried with anything more than 6 volts. Since then 7.4v packs seem to have become the new standard. So just use a regulator so you don't *popsizzlesmoke* your board.
I'm sure there's a way to use the hasbro board scrolling effect with a PC, CF, or any other sound board. We used to look for hacks like that all the time at TCSS... I'd bet that there's still old diagrams that would work for something like this.