I kinda ended up maping it out since I'm guessing you need to have a balance between the two of their routes rather nicely, I kept spending too much time with Samuel and triggering his solo route instead in almost any other variation (Sam will say Raj is busy in this case).
This is more for a reminder since I tend to delete the progress quite often with new updates and old savefiles stop working!
**Normal Samuel Route**
Silently Join and Wait -> Stay Quiet -> Side with Samuel -> Offer Some Advice -> Join Samuel and Julian -> Apologize for holding up the line -> Go around to Samuel and sit down next to him -> Ask where the others got their forks from -> Sure, you can have both -> ...head to bed as well -> Get up, even begrudgingly so -> It's drunk boasting at the tavern -> Let's leave it -> Ask if they need an extra pair of hands -> Actually I had pretty amazing dreams -> I can report it after I help you. There is a Doctor on board right?.
**Combining it with Rajeeyah's Route **
Can I stay a little bit longer? I want to make sure Samuel's fine -> How about you worry less about your polishing... -> Tell him your side of the story -> Check on Samuel again -> Decline the offered rum -> Rajeeyah picks you up just as you are on your way to get some rest -> No (Don't ask for anything in return)
**Back to Samuel, and then Raj**
Don't break the silence -> Stay safe on deck -> Punch the hull of the ship -> I'll try, but it's difficult to enjoy it under the circumstances -> Of course Sam! -> Rajeeyah -> Maybe he's a royal spy... -> Don't ask her (about who needed the wormwood) -> Leave the room -> She seems pleasant, I've always enjoyed it when I had the chance to assist her -> Recall her partner -> They escaped? -> Yes (have you been in love?) -> Did you want to be? -> A crook? -> Suggest that it's time to move on.
**If you did this right, then she should call you "kind" instead of other things**
Join up with Rajeeyah and Wolf -> I didn't say it wasn't worth it -> She must be talking about her lover -> Offer to help her in town, if she's willing to translate -> Ask Samuel -> Volunteer.
**Start of the Poly route? **
Get ready to go ashore -> Beer for me as well -> Stay with Nomax and Sam -> Stay with Samuel -> Tell Sam not let Pierce under his Skin -> Tell Sam you're happy you know him, too -> Well... yes. But not enough to cause trouble (Did you want to join?) -> Playfully tease Samuel -> Suggest that she stay -> Let Raj and Sam steer the conversation -> Well, Sam doesn't have any options in the Conway
Most of the options from the first half doesn't matter that much, but I've noticed if that you vary it a tiny bit in the second half then it goes to any of the individual routes, so maybe this is a secret Poly path? I doubt it but I'm very curious about it. Sorry for the long post, this is mostly to remind myself how to get it again, since I delete the save files quite often!