You do you but Whalevault is not even opensource, so 1) I couldn't merge it if I wanted to, 2) you use it at your own peril since nobody can make sure no code is added with malicious intentions.
They do have a github page for reference :
https://github.com/alexpmorris/whalevault
But there's nothing there except a license and a README.
They cloned two years ago so I'm pretty sure we re way ahead in terms of features. That's being said, indeed we don't plan on supporting other chains.
First, Hive Hard Forked couple of times and there are features which are not supported by other chains. Second, except from you, we've never really got any demand for this.