Don’t forget that Eldritch Blast is charisma based, not wisdom, and like that there are several cantrips based on other things then Wisdom, this might be where the Spellslinger has balanced downsides, as Eldritch blast for example is strong when used by a warlock/ high charisma character. So you might deal less dmg while the higher levels provide multiple hits at reduced dmg.
You should probably look at features for lvl 6, 11, etc. To upgrade some cantrips.
Be warned that cantrips only severely reduces cc options because hold person/ sleep and others become unavailable. How to compensate that?
If spell slots is your thing to circumvent you might consider the optional rule of spell points.
No apology needed, I learned things from you. Thank you for actually bringing it back to me. I’ll use this to improve my knowledge. Thank you