As an E² blaster from way back (2004), I'm kinda ambivalent about this proposal. I kinda like that Energy Manipulation is relatively unchanged as the OG blapper secondary, that it harkens back to The Good Ole Days™ when we were younger and wilder. But that's just nostalgia, I guess.
Yes, I'd prefer that Energize be a toggle instead of a click, and it does make it more consistent with the sustain toggles in the other Blaster secondaries. And I'd also prefer that BR be a passive instead of a click, too. But I'm concerned that this might "homogenize" things too much, and eliminate some of the peculiarities that distinguish Blaster secondaries. */EM has always been the "clicky" secondary, and this would change its identity.
Replacing Stun with Whirling Hands is an interesting idea. I've never taken Stun, ever, and I've made/re-made/re-spec'ed my E² Blasters countless times over the years. I might actually try a Blapper build if I could take WH instead of Stun. PT, EP, BS, and WH would be cool to try -- especially since I can't make an Energy Melee Scrapper. But if they ever port EM to Scrappers, then that reduces the appeal of blapping, for me.