I had a reply from rms - he sent me a copy of what he said to tonlee the day
before.
In summary: he said he's going to ask the FSF people to take a look and let
him know if they think the project would be a benefit to free computing. He
also said that the FSF would only endorse a crowdfunding campaign if it is
run on a site that uses free Javascript (which is understandable).
He said there are two crowdfunding sites that are known to use free
Javascript: Crowd Supply and Goteo.
I had a look at Crowd Supply and they seem pretty good. It looks like they
are quite strongly geared towards free software-compatible hardware projects.
According to their Wikipedia page, they have a high rate of success, partly
because of their close management of projects that they run. It seems that
they also have the ability to help with fulfillment (i.e. shipping and
handling), which could also be a plus for this.
Perhaps I should get in touch with them and see what they think about these
Raptor boards?