PowerApps + PowerAutomate then? If you have such licenses and wanna go native MS then this works like a charm, even on mobile. Doesnt take long to prepare, i think it is even a PA example that MS has. Ill try to find it.
Edit: I know this is a selfhosted community but MS tools work well with MS tools :D
Afaik, MS Teams now has a native status thing, which shows you as either in Office or WfH. Would that suffice?
Edit: it doesn’t show up on my iOS app, so maybe it is on desktops only.