Im interested if there id room, though I am curious if this is going to be a discord or a forum ran adventure.

Also Pathfinder isn't that bad in the math department. Its a bonus heavy game. The rules are essentially similar to 5e with some differences. There are more rules outside of the basic, but those are more for freedom rather than stop players. The players generally don't have to know the advanced ones to play.

For example, a gnome can grapple and pin a dragon, that is allowed. They just can't bull rush, overrun, reposition, or trip anything two sizes larger than themselves. In 5e this wouldn't be allowed in general.

And creature sizes offers disadvantages and advantages. Small creatures are generally weaker and deal less damage, but have an easier time hitting and avoiding getting hit (+1 ac, +1 to attack rolls for small creatures) and a larger creature is easier to hit (-1 to ac for large)