I'm going to break with most of you here, and say that it sounds fine to me, as long as you organise a couple of English speaking nannies for the ceremony.
For the people that come, its a holiday in the sun, and your wedding, and the ceremony is only a small part of that, so it's a tiny proportion of the holiday that you're asking them to have the children in childcare.
The alternative is that you plan for the children. We had about 25 under the age of 6 at my wedding, but we didn't have any noise during the vows. How? We put on the initial invite, for the parents, that if if their child made noise, could they please go out. The vicar then reinforced that at the very start, when reminding puerile people to take switch off phones etc. Those Were were the sticks.
For the carrots, there was a creche at the back of the church, and each child had a colouring and puzzle book we made about the wedding, with crayons, with a colouring competition for the reception. There were also snacks available.
For the reception, they had a large room next to the main hall, with toys etc, which we brought in, and lots of large cushions and affirmed airbeds for napping and sleeping later in the evening.
There was no screaming or tantruming. I'm not a massive children person but in keeping the children happy, it kept them occupied and quiet, and therefore enabled the adults to enjoy the time too.
So, I don't think you're unreasonable in wanting a child free ceremony, but if you have them there, there are measures you can take to make it less likely they'll cause problems