Chatted with a beta tester today whom is a Linux guru and the mention of what you'd done with Wine and asking him to check EasySpectrum and EasyPower functionality was likened to kicking him in the gonads.
However he was right that everything is going to webserver but currently EasyWaveX has a little feature set of its own for the current range of SDG's but SDG7000 might change that however it's likely to be out of the hobbyists budget.
Above my pay grade what you've done but watching with great interest as a Windows user.
It's good that they are moving things to a webserver, however I wish they would hire professionals to do the UI. The web interface has really bad UX on my SDS1104X-E.
Granted, I am very biased because I build web applications (not websites) for a living.
As a hobbyist it is highly unlikely that I will be able to justify anything beyond the next level up compared to what I have now. Even if they move completely to web UIs, that won't affect me unless they backport those solutions to the entry level devices.
I was actually thinking that much of the UI could be implemented via client-side JavaScript and unless there is a storage space limitation, we should be able to replace/extend the built-in web UI on the SDS1104X-E.