Non-lethal to moles or non-lethal to everything? When I worked landscaping we used a grub killing treatment for mole prevention. Any kind of repellent is going to be pretty ineffective when there's a good source of food there. The mole holes also make the soil more aerated, which makes it more suitable for grubs, too.

If it's very wet soil you can make it less attractive to grubs by not watering, changing the soil composition, and adjusting grades, but that's a lot more complicated than spreading some grubex.