If industrialized nations want to increase their birthrate, the best example for them to use is the post-WWII Levittown scenario. It actually takes a lot of special planning to make a baby boom, and the US stumbled upon it by accident.
First, build or rebuild a city intended and planned solely for young married couples and small children. People beyond child bearing years, singles who want to play the field, and others who are "out of the game", are not invited to live there. If they can't have kids, they get transferred out of town. It should be clean and well landscaped.
Second, make moderately paying, but very boring jobs available for men only. Job promotion is secretly based on number of children. Women as homemakers are put in intentionally boring circumstances, with some modest home-based businesses available. Very few adult oriented entertainments in the city.
Third, design medium-large homes in clusters, with small private backyards, and a large common backyard for each 6-8 houses. Limit travel out of town.
Fourth, bring in religious leaders who emphasize having children at their services. With plenty of OB/GYN services, have little or no birth control and only medical emergency abortion.
Prior service military personnel are good to recruit from, as they have already had considerable physical and psychological screening. Women who come from large families and otherwise express an interest in having more than the usual number of children are also good candidates.
Behind the scenes, it is actually a very authoritarian place, but that is not obvious to those who live there. But the real purpose of the place is to propel a baby boom; anything else, any other prerogatives, governmental or individual, have to be secondary.
Your plan sounds good except the Germans will never accept living in a society where's birth control is limited and there's no abortion on demand.
Your plan sounds good except the Germans will never accept living in a society where's birth control is limited and there's no abortion on demand.