Not directly in itself, but much further ranging reform is needed.
Child maintenance should be set by the courts for a fixed period e.g. until child or children is 18/leaves full time education.
Income and assets should be taken into account when setting the amount.
No variation possible based on any further children that come along. Plenty of people chose not have an additional child based on not being able to afford it. Doesn’t matter if it’s with a new partner.
No variation possible based on change of employment status. The responsibility to the child doesn’t change. Redundancy insurance should be mandatory in cases were there insufficient assets to cover any potential shortfall.
No variation possible on change in health circumstances. Illness insurance should be mandatory in cases where there are insufficient assets to cover any shortfall.
Assets should be non-transferable without court permission, similar to the way in which a home that is registered as a marital home cannot be sold without the permission of both parties.
Any employment at below market rates or use of company structures to falsify the true income picture should be criminal fraud, punishable with prison time.
Any failure to pay should be met with seizure of assets and punishable with prison time. If a resident parent chose to stop feeding/housing/clothing their children they would be charged with neglect. Other penalties may be suitable e.g. loss of professional licences.
Any debt accrued in respect of child maintenance should remain after bankruptcy. It should be possible seize assets including pensions, as should anything held in trust with the NRP or any subsequent offspring or any relevantly financially connected person as a beneficiary.
If a new partner chooses to pay to keep someone out of jail, that’s their call.