I'm not sure how to best synergize with Seraphynx, but I can comment on the idea of support loadouts. Swords, guns, and bombs all work in a support role, although bombs are the obvious choice.
Your sworder support loadout is okay but not great. I can understand DA and GF, due to knockback. But maybe you want a sword that spreads status, such as Triglav? Instead of Argent, which has no merits other than ease of use, consider a gun with knockback (Polaris, Supernova, Valiance) or status (Storm Driver, Obsidian Carbine, etc.). Or don't use a gun at all. Playing pure swords is fun. Also, I don't understand your trinkets and perk. Why not health or status trinkets? Why not movement speed, health, or status perk? Those would suit your defensive play style better, wouldn't they?
Similar remarks apply to your gunner loadout. Why not use guns that spread status or deliver knockback? Why use offensive trinkets and perks, when there are defensive ones?
You said that you don't want to play bomber unless you can get away with one universal loadout of bombs. Here it is:
* a vortex bomb
* Voltaic Tempest or Stagger Storm or Shivermist Buster or Venom Veiler
That's two bombs, and all that a support bomber really needs. If you want to use three bombs, then pick another one from that list. Or consider Nitronome. Because of its knockback, it can also be viewed as a support bomb in certain situations (Unknown Passage, compounds, etc.). It will also let you deal damage occasionally.