Well, touché, perhaps, depending on what you mean by complex. It would be unreasonable to expect a financial advisor to implement a complex investment strategy inexpensively, but—in contrast, for example, to attempting to approximate a broad index by constructing a diversified portfolio of individual stocks, which would circumvent both the PFIC and the PRIIP issues, as would acquiring ETFs indirectly by buying call options or writing put options—the buy and hold strategy described above, which would involve at most two trades and one cash transfer out per year, is the essence of simplicity, the complexity being entirely a matter of the tax and regulatory environment.
I do understand that American FATCA reporting requirements impose compliance costs on financial institutions, which is why so many retail brokers are unwilling to accept nonresident US citizens as clients, but presumably economies of scale apply here, and those that do—like Interactive Brokers and Schwab—do not charge nonresident US citizens extra to buy shares of individual stock.
So I would have thought that it should be possible for a Irish financial services professional who has an institutional account with Interactive Brokers, for instance, and that MiFID regulations do not preclude from doing so, to buy American ETFs on behalf of a client without having to go to too much trouble, but—since “you don’t know what you don’t know”—I’m open to correction.