Unless they're already nearly obstructed or having sub-acute respiratory issues now, I wouldn't trach them "just in case". If you're that worried about the localized laryngeal disease, you could do chemoRT to start or just a short course of palliative RT (5-10 fractions) before starting systemic therapy. It will respond quickly.
I treat all non-pulm small cell exactly as I do pulmonary small cell. You might need to argue with insurance about it, but I think you'll win.
I would do chemo-IO up front with maintenance IO. I haven't personally tried maintenance lurbi yet and I'd probably try to hold that in reserve for progressive disease since it will be easier to get approved and started than tarlatamab. If you can get tarlatamab covered (and you can administer it, my office doesn't do that yet), I think it's a reasonable option down the road for a good PS patient.