Welcome to the forum and I too think it's a great idea and one that I would be keen to carry on if it were my family
Take some nice photos of the occasion to give to your son or daughter when they are older, I'm hoping you have ones when you were born
I'm not too up on recent baby seats (youngest is now 14) but I would guess that there are still dual isofix and 3 point seat belt fastening carriers around which would work in the front
When my eldest was born we didn't have isofix
Let us know how you get on