I know this is not what you mean specifically, but technically we can do an almost permanent temporary one now via refreshing using any moon. I've kept a single moonblade active for about 8 hours through several Moon cycles once already, including a period during said cycle when there were no moons up. The only time it would be forced to interrupt is if there are no moons for longer than the time for which you can refresh. Or you forgot to refresh, of course.
