spoke again to TL and asked if pine64 would be willing to look at sponsorship witn rockpro64 boards (the ones that take 4x PCIe): if someone from debian were to contact him direct he would happily consider it.
i then asked him if i could cc him into this discussion and he said he was way *way* too busy to enter into another mailing list discussion, so if someone from debian emails me privately, off-list, i will then cc him and/or put them in touch with him on irc. i can also be reached on freenode and oftc as "lkcl", if that is easier. l.