Detroit needs residents. My 4 point plan:
1. Flat federal income tax rate of 5% for 10 years for individuals residing in the city.
2. Permanently eliminate the zoning and planning boards. institute low flat fee construction permits and business licences.
3. Zero or very low property taxes for 10 years. reasonable taxes thereafter.
4. Close the government schools and institute a voucher program
Make people with jobs and money want to move in and things will fix themselves.
Detroit has a history, of liberal policies, which people can view and will give most if not all a reason to pause and think more than twice (imho). This is probably the first of many more to come in failures of large cities and seeking bankruptcy protection which too will be ripe for failure. Your partial plan is a beginning but one the ruling class will fight tooth and nail.