There are many reasonable ways for two people to decide how to split assets. My XW and I “bid” on ours. The highest bidder won the item. Quick and dirty and done in a day.
As for the lawyer, I strongly recommend getting a consult with a lawyer recommended by a friend to alleviate your fears and know what your rights are. If she’s getting advice from someone experienced in divorce, they may not be intimidated by attorneys, and probably know involving one won’t automatically cause tens of thousands or a contested divorce or fantastic legal maneuvers. You sound like you might be overestimating their cost or effect.
Be slow to agree. Hardly anything is so urgent it can’t wait a few days to be reviewed.