1) Has anyone re-skinned an alchemist with something other than potions and extracts?
2) What would be the best way to do the above with harrow cards and deadly dealer/arcane strike what would need changing to remain balanced?
2a) Yes thinking a gambit style character alternate to card caster magus.
3) Apart from boreal bloodline for sorcerers (eldrich heritage) is there a good bloodline to enchant cards?
Nothing ?
Seems to me that Harrow Bloodline would be the closest thing to what you want (for Eldritch Heritage or Variant Multiclassing). The 15th level power is a really brokenly strong trap construction kit, but I haven't (yet) heard of it getting nerfed by the latest batch of Errata/FAQs.