Thanks for this effort.
Have you been using Wire on a desktop PC? It can be dead slow in collecting messages. It runs as some kind of web application in a window.
So if you were to get it working on Maemo, I 'd expect a scenario as Maemish describes but than even worse. Slow and painful.

I think Jolla would be our best bet.

That said, I am a supporter of Wire (after using Jitsi, it seem that Wire is much more user friendly)
Wire are the de facto Skype replacement and they offer a balanced mix of privacy & professional options.
The only way to get rid of the awkward situation where our phones batteries are being sucked dry because of the need to please every contacts need to use a different messenger is to have a good one elegantly and efficiently integrated in the smartphone OS.

Just like the Nokia N900 offered with SIP, XMPP, Skype,... out of the box.
Enter your accounts and call.
Tears in the eyes beautiful to be able to see which contact can be called by which protocol straight from the contacts list.

As long as we continue to call these devices phones, I find it ironic that so little effort is being done to improve its functionality as a phone.

While wire could be integrated in Sailfish OS, Jolla can't even get an integrated SIP sorted out for calling. Because that is waaay to complicated, right? Because we all use Facebook to communicate, isn't it?
Let alone setup a meeting with Wire to integrate their service into the Sailfish OS.

The beautiful integrated internet chat/call functionality might as well have been one of the reasons why nobody stood up for Nokia when it got drained from its lifeline towards a successful future with MeeGo Maemo story.
By killing profits of traditional telecom providers who'd prefer to keep us stuck in the nineties for voice calls + charge a year 2000 premium for SMS, you don't make good friends in political and business circles.