It would be nice to be able to more easily change the HTML and styling of child fields at checkout.

[ideadude]

Is your feature request related to a problem? Please describe.
If your checkout page is very stylized or you just want to change the heading of the child fields section, you can only do that by either editing the plugin or overriding a large callback.

Describe the solution you'd like
It would be nice if content like this was either run through a filter or otherwise easier for devs to tweak:
https://github.com/strangerstudios/pmpro-sponsored-members/blob/dev/pmpro-sponsored-members.php#L1057