I know there are other kind of license available. We need an advice from a lawyer (I know there are at least two in the Guild) or/and the point of view of a contributor of the original project because we need to anticipate problems that might arise later.
I suspect that changing a license in the middle of the project is probably impossible.

I considered that the project could go into publishing at some point but I haven't thought about it more than that since that's not my main motivation.