Hey Ben
My feeling is that there are many millions of Strats out there with strings that don’t sit nicely over the poles pieces and, most of the time, it’s not an issue. It’s one of those things that might look wrong but probably sounds just fine. Have a listen and use that information to determine if there’s something to worry about.
If it really is a problem, you can get different pickups. There’s already a blade pickup installed so maybe the owner is willing to go with one in the bridge position too. Some makers offer different string spacing for Strat pickups (Kinman, for instance). These aren’t all that common but you might find some that work.
Personally, I wouldn’t file/notch Strat saddles to try change the string spacing. If it’s really an issue, it might be worth seeing if you can find a new bridge with a tighter spacing although that comes with playability considerations.
Short version: There’s a pretty good chance it’s not a problem aurally but if it is, the owner might have to compromise pickup or bridge choices.