I’m just a guy, no connection to LIFX other than I own a few. This is a community forum. I’d ask them directly via their support channels, although it looks like they may not legally be allowed to sell E27 bulbs in the US.
I have such a “B22 converter” but it seems its not perfect and is working for E27 but not E26 . I have searched Amazon as well and found them but my concern is that they end up being the same then its pointless.
Sorry, can’t help there. The ones I linked to say E26/E27 in the descriptions, so at the very least you can ask for a refund if it doesn’t work with an E26 bulb, because that would be false advertising. Short of either buying a few and trying it or getting in touch with the suppliers to confirm I can’t think of a solution.
You could probably get away with sticking something conductive in the bottom of your current adaptor, but I wouldn’t personally try that with a bulb I wanted to last, and you’d have to make sure there was no chance of it dislodging and shorting.