I have been working theoretically how to do this. I can do design and markup but would need some coders and dba's. Basic premise is there are 3 calls to action. Donate, Volunteer, Travel. Each specialized based on the org of course.
Maybe something like civicrm would give you more ideas/starting point?
<a href="https://civicrm.org/" rel="nofollow">https://civicrm.org/</a>
not to x platform I created <a href="https://www.reddit.com/r/wildlifeconservation/" rel="nofollow">https://www.reddit.com/r/wildlifeconservation/</a>