Know of any non lethal ways of keeping them out? Their tunnels have made my yard a collapsing maze of traps and non lethals such as noise sticks aren't working. They are cute.
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.
The moles are once again reaffirming the Viet-Minh's finding that tunnel-based guerilla warfare is super effective
Sorry you're getting owned by the Cu-Chi tunnels they've set up in your yard. Don't try to follow them into the tunnels, they likely have sentry snakes, scorpions, and punji spike traps.