Waiting for a bug fix is more sensible than starting a huge software engineering project to work around it. Google do respond to bugs - sometimes it takes a while - but they are far more communicative than driver vendors, and then even if they fix it, the update may only be distributed to a fraction users worldwide, due to their policy of dropping support for driver updates for old hardware after a few years.
I do understand it is hard to hear as a customer, but waiting for improvements does work. Around 2011 when everyone was exasperatedly telling us what were we thinking, we should make a Flash exporter, and I still argued then that the direction things are going in is more important than the specifics of the situation right now. Where are those "you must make a Flash exporter" people now?
I guess if you absolutely insist on the necessity of a native exporter, then maybe there are other tools out there which can provide that for you. But I do think that would be somewhat premature at this stage if your main concern is the status of v-sync quality in Chrome - it's probably not going to stay the same forever.
I mean, for me, and I would imagine others, the dependence on dev teams that have C2 as an afterthought has failed. Of course the same arguments always come up, "What about driver bugs?", "This is only one bug!", etc etc. These are all academic, in reality, when you design a game with features listed in C2 that then don't actually work, and stay that way for literally years, that leaves a bad taste in your mouth. Especially so when when gaming related issues are often put behind stuff like browser security or whatever is of most importance in browser vendors. Just as an example, Number of times I've had to wait for over a year for some bug affecting my unity projects to be addressed = 0. Number of times in C2 is like 5 (though, yay, I think I'm on the last one now!). And the complexity of the unity projects is vastly greater than my C2 projects. Maybe driver vendors are unresponsive, but their code appears to be far more mature than chrome's implementation of HTML5 and their priorities are more aligned with game devs. Also typically driver bugs don't affect your entire customer base, etc etc. I'm just speculating here, I don't actually know why, but of many, many tools I've used, C2 is the only one where I can't actually publish my projects years after they've been completed, and the ONLY product where devs outright just point you to Google or some third party (in other products usually they may implement some work-around for some bug out of their control, etc). I'll leave it to you to figure out why C2 has that problem rather than debate with you with academic arguments.
I'm not saying that a native exporter is what you need, but your product needs to depend on technologies that are more mature, that you have more control over, and whose development teams closely share priorities with you. None of these things were the case for C2. Because of the technologies C2 depended on it was essentially an Alpha or Beta stage product throughout its entire lifetime, with Scirra being essentially helpless in pushing it out of Beta until chrome devs or Intel, or whoever got around to it. This just makes it impossible to plan stuff. YOu never know if a bug will be fixed or with what timeline (whereas with all other tools I've used, you do), so should you re-design your game? Wait until the bug is fixed? Who knows? Certainly not Scirra. You can't plan anything.
Anyway the bottom line is, customers shouldn't really prescribe the specific solution. At the same time you should appreciate that they are unhappy and that unhappiness is for a reason. So as a professional company, maybe you should figure out the solution as to how to put yourselves in a position where you can address bugs with something more meaningful than "oh.. but... GOOGLE!", whether that's with a native exporter, Scirra's own wrapper, or whatever. Just know that right now you are not succeeding on being able to provide support for your product, and no professional in their right mind would depend on such a product.