Just tossing this up here because kenji said he wanted a post with numbers to back my claim. Feel free to yell at me some more beneath this post, but I won't be responding. My case is made and it's in the jury's hands now.
The two things that stand out.
The sail bard: 23 bard/3 evangelist/5 loremaster. (the +6 from evangelist alone may be good enough to hit song 30 if the loremaster synergies work right, if not needs divine favor)
Strengths: gets 30 bard song, gets a free +10 to sail thanks to loremaster gift of the explorer and cleric domains which equates to a +3 to their sea shanties on a ship the sea leopards' size, a +2 or +1.8 on the bigger ships. For comarison, song of the heart where you need a gazillion feats only gets +1. Gets access to loremaster epic feats as well as open lock and disable trap.
Weaknesses: Bad against dispels (though no one expects them to be good in pvp), lack of epic feats (but loremaster makes that a wash in a lot of ways).
I get that some devs don't care about sailing at all and therefore think dismissing sail balance is easy, so I ask you to defer to those who do. I also get that there are some devs that think the need for bards at all is bad design, and while I disagree simply because bards are the bridge that makes sailing work for any build, not just wisdom builds, there is a real debate there even if the solution would take a reimagining of the entire sail system to get to. But even given that, the existence of the evangelist dip doesn't make it better, it makes it worse. Now you have to have an even worse version outside of sailing of a bard, making it more miserable to play outside of sailing.
The dirge: 17 bard/3 evang/10 dirge (+11 from cleric thanks to divine favor scrolls, +2 from dirge to hit 30 bard song)
Strengths: 30 bard song combined with the powerful dirges. For comaprison, dirge singer was designed to not get higher than 22 song. Access to epic tier undead through a curse song to go with your 30 bard song, access to curses that unless this was changed are not removed by lessor restorations. Can get 30 cl vs dispels thanks to dirge counting the evange levels as well as stacking with bard.
Weaknesses: Only 4 epic feats, though I suppose you can count the mummy dust song as a fifth.
I'm just going to let this speak for itself.
As a final note, on behalf of all these folks that think I'm a fun killer and hate people for making lots of gold, I think that maybe what folks are telling you by finding ways to skirt the cross-class synergy limitations of bard song that maybe bard needs some help. And while this may be surprising to read for some of my biggest detractors, I'm fine with that. It just shouldn't come at the cost of some random class splash, especially something that is so loaded with rp expectations as a cleric. And it certainly shouldn't dirge, janked up sail bard, or bust for an entire class.