Saeviomagy
Adventurer
Whether driders are Lolth's chosen or cursed only matters if your gods directly interfere in your world.
It's entirely viable to decide that your gods are more distant, and the magic will happen regardless of Lolth's will if the appropriate ritual is performed.
At that point, you can decide whatever you want when it comes to the effects of a ritual upon a member of a race that it was not designed for. My suggestion would be to add some spidery features to each of the characters (different for each one, and with upsides and downsides).
It's entirely viable to decide that your gods are more distant, and the magic will happen regardless of Lolth's will if the appropriate ritual is performed.
At that point, you can decide whatever you want when it comes to the effects of a ritual upon a member of a race that it was not designed for. My suggestion would be to add some spidery features to each of the characters (different for each one, and with upsides and downsides).