Kirigami is somewhat different from Sailfish QML since it targets mobile and desktop at the same time. In practice, it actually seem to work, as far as I can see on Pure Maps example. Kirigami is actively developed which helps when you hit bugs in it. Its not as polished as Silica and there are few things missing (attached pages, few signals, to name few), but they may get implemented if asked for it.

After working with Kirigami for few month: Maybe it would make sense to port Nemo / Sailfish over to Kirigami and make its own styling through https://doc.qt.io/qt-5/qtquickcontrols2-styles.html (Kirigami has desktop KDE style and Plasma mobile style). At least its already on QC2 and, as such, its not a big extension of regular QC2. They mainly rely on QC2 styling and add just things that are needed to comply with KDE HIG. However, they do try to get towards swiping UX, just may need some help to achieve it.