I still think having a narration or just text line suggesting he might have the ability to compel even with tadpole might solved everyone's issues. Then they dont have to change the kisses.
People who want the smiles can 'know' their character isnt compelled.
People who dont can then 'know' their character is being compelled by an ascended vampire. Which makes the story more tragic.
This is the minimum effort for the devs and is closer to making everyone to happy with their RP/HC.
i think it is clear in the game that spawn cannot be compelled as long as the tadpole is there. also this wouldnt be any less work than to just add two options for internal monologue, not even a voice line is needed.