Hello Richard,
I am glad that there are students like yourself who are enthusiastic in using the platform for educational purposes. As you mentioned and per this FAQ “Only faculty members who are teaching courses which meet the requirements” can apply for the Google Cloud Platform Education Grants program. Hence, and for further help, you may contact sales as they are more knowledgeable about the subject.
Answering your last question, and per this document, Prepaid cards and Virtual Credit Cards (VCCs) are not accepted as methods of payments. However, and per the same document you may instead set up a bank account as a primary funding source. Since you mentioned you are having trouble with adding it to your billing account, you may check this document for how to verify your bank account (may take up to 10 days or use instant verification). I hope this helps.
Hello Richard,
I have reported the document as to be reviewed per you suggestion. You may always report document issues from the same page by clicking the “send feedback” link. On the other hand, if the bank verification is always failing, it could be a limitation set by the bank itself, and I suggest checking with them. If that is not the case, you may try contacting Google Cloud Platform billing support as they are more equipped to help.