If its a newborn baby this may be of help - Mama's & Papa's had a navata carrycot which has a safetybelt inside for baby and attaches to the car safety belts and it is classed as a propper car seat. Therefore baby is lying down flat like in a pram when travelling in it.
Not sure if they still make them as I have'nt seen them in on their current web site, they look something like the pod.
I used mine until my baby was about 7 months and my sister-in-law is using it at the moment. The reason I bought it in the first place was that I had read that babies should not be in rock-a-tots for more than 30 mins at a time until at least 8 weeks old in order for their spines to develop properly. It was brilliant and baby slept in it for the first few weeks until old enough to go into the cot.
I wish you best for luck with your baby and hopefully you will be able to get sorted without having to go the US option.