Calculating "Power Level" or "Combat Score" in GURPS

[Calliban]

This is a campaign for Martial Arts enthusiasts, with a focus on a cinematic style. I am trying to come up with a straightforward method for measuring "power levels."

In case you're not familiar, characters in fighting Manga have the ability to sense the fighting spirit of their opponents. This is similar to the Power Level Scouter from Dragon Ball Z. In that series, Power Level is a single number that approximates how strong a fighter is.

For my campaign, only TbaM skills, passive Chi Powers, and Imbuements will be available, so there's no need to worry about Innate Attacks and other abilities.

My idea is to use a formula that adds up a character's maximum hit points (which also serves as an estimate for striking damage), maximum fatigue points (which fuel special abilities), and their highest combat skill level (or DX-1, whichever is higher).

Is this a reasonable approximation for "combat power", or should I try a different approach?

If anyone else has figured out a better or simpler method for measuring power levels, please let me know!