Tip protector rec.s? Mira Bella 120

Bought myself the gold hibiscus patent lame Mira Bella 120 heels for my wedding (several months away, giving myself time to get used to them), but I'm a little concerned about the stiletto tip. The ceremony will be on grass and I thought that I would be able to find a tip protector that would slip nicely onto the stiletto tip to make it easier to walk on grass.

Unfortunately the smallest diameter tip protector I've been able to find says it only fits down to 6mm and the tip of the stiletto on my shoes looks to be slightly less than 6mm, so the protectors just slip off. I'm perfectly able to MacGuyver something, but I would really like to not go that route if possible on the off chance that I damage the shoes. I just need the protectors for the ceremony, as the reception is in a concrete floor building (and I'll probably switch to flats before the night is through)

So - does anyone know of super duper narrow tip protectors that can help me out or should I just start planning my solution based on the 6mm tip protectors?