Using the DC system you already automatically support one very important cause - global Creativity !
but it is also simple to employ it for other Causes that are important to you:

Commission an ›S-type DC
this can can cost you money or not, depending on the flavour of your S-type.

Buy an existing ›P-type DC
a set (and public) percentage of such DC sale is given to its declared cause - simple!

Propose a Cause
if not finding your Cause here suggest that it is added, under one of the two options above. this might work or not - but worth trying.