He should not try to really talk with Carissa like this, he doesn't think, even if she has her +6 Wisdom back. Not until she has her own abilitystat increases to go with her headband. It would damage what's left of their relationship, and Carissa is one of the only things left in Golarion that still felt real to Keltham.
He types Carissa a letter, and doesn't need to retype it afterwards. It includes among other things the notes that:
- If Carissa wants to assassinate Abrogail, she needs to do that before his child is ensouled in Abrogail; which may interact in a complicated way with other plans to kidnap Abrogail and/or see if Carissa can don her crown as a way to impede Cheliax's invasion of Osirion.
- He will strongly push that Carissa wait until she's INT 29 to actually negotiate with Dispater or Erecura, but she can potentially plan that now.
- If Carissa has copious free time left over, he thinks she should help him develop his Magical Simulation of Magic because that'll be the key Skill for Wishcrafting. If she can't help with that or speed that up, so there's more total time to do it and make it safe, then what was she buying time for anyways?
- He's getting better now, sort of. But until Carissa gets her own abilitystat boosts, his new improvised psychiatric skill strongly suggests that they should only talk dispassionate strategy with him wearing the +6/+6/+4 headband, and not say anything about their relationship or their conflicting goals.