Follow sharkbait's idea, and remember to change the selection scale and scaling size of the unit, so it blocks the path that you want, because the model might be big, but the collision size might not be there, and the gate/farm might not be big enough to fit the gap.
> What to do?
I'd say give up on the idea and be happy without health being displayed.
If you insist, however, then create another unit with no pathing (use the pathing map for a shrub or something else walkable) and the model of an opened gate. When the unit with the key approaches, remove the gate and replace it with the opened one.
Our new website went up early yesterday. Health Empowers You. 200 smoothie recipe guide and soon we will have detox, cognitive enhancement, weightloss teas and some coffee blends. https://healthempowersyou.net/products/smoothie-recipe-guide
It never fails that as soon as I say something about the bots they come back - this time they are under a whole new IP range - one thing in common though, Chinese!
I am working on getting access to the old news portal under a different URL for those that would rather use that for news before we get a different news view.