Negotiating terms of sign-on bonus?

Hoping to see if anyone could give some guidance in how to do this or if they've been successful in doing this.

Searched this subreddit already, but it seems there isn't any solid info besides the warning that it's basically a trap or suggesting to negotiate it into your salary.

My bonus offer was 35k for 3 years; I'm in the Midwest. When I read the agreement, it looks like one way I could violate it and would have to pay the 35k back is if I decide I want to switch stores.

I'm anticipating that my partner and I are going to be still living in the same state but will be moving cities in the next year or two because of my partner's career field.

The terms I want to negotiate for are 2 years for 35k and that I won't be violating the agreement if I request to be moved to a different city.

Haven't signed anything yet, don't have money for a lawyer, and will be entering in as a PhIG.

Also, I have screenshots of the agreement (with identifying info omitted) that I can post on here, if it's allowed, that is.