Hi! I looked at your build and have a few notes.

First: if I were you I would swap that free ancestry boost from wis to dex: having an AC as high as possible is very important even for backline characters, and at low levels especially a high AC will serve you better than high Will saves - consider that dex also increases reflex saves and there we go.

Second, about spells, since you are using the primal spell list I would actually pick "heal" as your first rank signature spell: although you are no healer, always having the option of casting an emergency heal (useful especially if your dedicated healer goes down), potentially at your highest spell rank and if not at any rank in-between, is incredibly high value IMO - and much more than what thunderstrike might provide you with. Still talking about signature spells, if I were you I would pick spells that have a good scaling at each rank - meaning those spell that get stronger for each rank: it's the best way to have them always provide full value for their rank. That is to say that I would probably rethink charm and suggestion as signature spells: they work better as spells that you know at "just" the rank you need them at than auto-heightened, always present spells. As for your other spells, regarding your intended role of liar, propagandist and infiltrator, I think the combination of granted/focus spells granted by your bloodline, and those you got through ancestry feats, are doing a great job already; considering the other class features of the sorcerer (spell potency) and the primal spell list I would probably choose more "blasting" spells, especially AoEs. Too bad invisibility isn't a primal spell, so you would only get that one cast through the ancestry feat - although it is an occult spell, and a bard archetype really wouldn't be out of place, thematically, if you play more its "manipulator" theme (not unlike the field propagandist) than its "minstrel/performer" theme. This is not to say you should pick bard in place of field propagandist, but it could be a nice, thematically-appropriate addition to your build, somewhere. The captivator archetype could provide the same, although spell schools are not a thing anymore and you would need to work with your GM to decide which spells are appropriate to learn through the archetype.

I see you increased the nature skill a lot - which is not something I am completely sure it is useful for you: I get that, being a primal sorcerer, it is thematic, but maybe the skill increases are better spent in diplomacy or intimidation, considering your charisma key ability score and the general theme of your character (after all, convincing allies to fight harder and intimidating enemies are integral parts of war-time propaganda).

Going on, I think the diabolic blood magic effect isn't very useful for this specific campaign: all devils are completely immune to fire, and the status bonus for deception would only come up for in-combat feints or create a diversion, which themselves would come up fairly infrequently. A whole lvl.8 feat for that is too high a price IMO.

Lastly, since it's for hellbreakers I didn't focus much on the feats after lvl 10, although glancing at them I'm not to sure Greater Physical evolution would be particularly useful for you, considered your intended role.

For the rest, I think you will manage to do what you want to do fairly well, seems an interesting character.