It's very possible but I'd ask on the WC thread. When I first got the HE like 2 years ago I jumped on WebCoRE because I really like the interface and like you used it on ST. I had too many issues with hub lockups etc so changed to RM and haven't gone back. I have been following the progress though and it looks pretty interesting and maybe the issues have been solved or worked around. I may spin up a spare hub for giggles and give it a whirl.
As my system has grown (now up to 3 working hubs) I've been feeling like I want to optimize things a bit more so I've started writing my own custom apps that are direct replacements for RM rules. This is working out pretty well and I recommend if you are into that sort of thing.
The other server you might want to check out is Node-RED - I'm not sure I understand it completely but the visual interface is very slick and you can do a lot of amazing things with it. Some folks here are using it to run rules, collect data etc.
One other app if you haven't seen it yet - HubConnect, a third party app that links ST and HE hubs (Also HE to HE) so they can share devices. VERY nice.. I use it to communicate between my hubs.