You can apply for a PAN card if you are an OCI holder. Refer to form 49AA here - https://www.protean-tinpan.com/services/pan/pan-index.html This can be done online, attestation will be required though of a copy of your tax identification document (SSN card for US)

You should maybe just create your own wiki for all this stuff. It's nontrivial to search it ourselves

Yes, on point, we plan to post all of it on our blog (https://www.goinri.com/blog)

Best of luck, hope you succeed!