There is an issue of public behavior in a community. I know Sephardi Rabbis who tell their people to use Ashkenazi eruv even when it is not according to Sephardi halakha. (I am not sure though whether such Rabbis use the eruv themselves). Chasidim, typically, would not use such an eruv even if their “Sephardi” halochos are acquired …
So, according to this shita, if you live in the community that uses an eruv, you can too. But, if there is no community minhag, as it is – sadly – often the case, then you should follow halochos of your narrow kahal.