Sounds like fun. My knees don't permit such hikes, but I certainly envy you.
Some of Lucas's links might lead here, but this is a useful link:
And, Switzerland Mobility has details on major named hikes, as well as good maps.
map.wanderland.ch/?lang=de&route=all&bgLa yer=pk&resolution=50&s eason=summer&E=2633795 &N=1167968&layers=Wand erland
I find it hard to use, but, one thing is easy. Focus the map in on a region, and make sure Hiking Trails are visible (click on Wanderland in the home page menu).
Some green lines will be heavier then others.. Click on those, and they will take you to a lot of detailed information, mostly for well known named hikes. I really like the altitude profile, and accommodation infpormation is available.. Lesser trails wills come up with "no further information."
You can also use the search function to search for location names. Sometimes works for trail, such as the "Via Alpina."
I use it on a trial and error basis.
Finally, there are a whole lot of good topo maps available in various formats.
The best are made by the Swiss Federation Land Office. They are described under products on the SwissTopo website:
That site also has a very detailed on-line map with many many options. I use it when I want to see fine details:
map.geo.admin.ch/?topic=ech&lang=en&bgLa yer=ch.swisstopo.pixel karte-farbe&layers=ch.bav.ha ltestellen-oev,ch.swisstopo.swiss tlm3d-wanderwege&layers_visi bility=false,true
I turned on hiking trails in the menu. Color coding is the standard convention. Do you know it?