In looking around for existing resources that would help me develop this I found:
Creating an add-on to insert tabs in profile page (using hooks)
which is pretty close to what I need, except that it's on the profile page and not members and figure it should be straightforward enough to adapt. However, the other main issue is that it relies on the now deprecated template hook system, so I'd need to use the Template Modification feature introduced in 1.2 instead:
Template Modifications and Comparison
Not having any prior experience in template hooks/modifications, I'd appreciate some advice in how I would go about this development.
What are the core ingredients I need? Are there any existing free resources already doing this that I could learn from? Is it trivial enough to augment the template hook tutorial to use Template Modifications instead?
Thanks in advance.