Wow, that trick is amazing! I only knew that a while ago...
Anyway, hopefully an [initbang] kind of thing will be included in Vanilla one day, maybe as a flag to [loadbang]. There's been discussion about it on the pd list, but it might take a while or never happen though.
I went through a similar problem, I needed it for an abstraction with dynamic patching in my external library, but didn't wanna add another dependency, so I had to come up with my own external [else/loadbanger], which incorporates many features from different objects like max's [loadbang], cyclone's [bangbang] and [initbang], so even if this gets included in vanilla, I can still have an use for this external. Now, if I'd known about this trick, I probably wouldn't have bothered to make this external
It's good that the demise of Extended is forcing things to be included in Vanilla, but that's still at a very slow pace.