It seems that development of re-alpine, which is used right now for the slackware alpine packages, has also stalled. Alpine development is now continued here:
A lot of fixes and improvements have already been implemented. So, I'd like to see this included in the next slackware release.
Before anyone jumps: I know I can build a package myself using the slackbuild. In fact, I have. My point is that I think it would be a good idea for slackware to include this.