Well, Boeing paused their dividend last year, and while there is speculation that they would resume it at a later point, best case scenario would be half a decade until then.
Sector-diversification is an important and often overlooked part of a high-yield portfolio. As well as some financials, I would suggest Diageo, Unilever and Rio Tinto to cover a few other sectors
Regarding high-quality pipeline, ENB, MMP and EPD are definitely high up there, although I believe EPD might be lagging a little behind ; ENB while supposedly being the highest quality, is also priced accordingly, lowering its yield quite a bit, and as a Canadian MLP it is subject to 15% dividend withholding tax.
Hence my pick of MMP instead, a very nice mix of high quality business with very high net yield.
Given I have looked into this stock myself, it moves Liquid Gas and Oil across Pipelines, it could be classed as Utilities or Transportation. Not that hard, like you say.