Hi Kimberlllymd -
Welcome to My Swiss Alps.
There are many such options throughout all of Switzerland. The hiking trail network ( die Wanderwege) offers endless combinations, and good maps are available. Your list can be matched many places that are not actually in the Alps.
Der Weg der Schweiz (The Swiss Path) meet all the stated requirements except for being in the Alps, using public transport to close the loop, depending on just how much of the full trail you wish to take.
This link mentions it at the beginning and you can take the search from there:
It is also in the Switzerland Mobility web sight linked further down this post, foe example, at:
which leads you to all three stages.
However, even if you restrict yourself to alpine regions, as you request, some work with topo maps can show you many such trails. So can the links I have provided below.
Finally, I urge you to forget about parking your car at the trailhead. Noy necessary. Public transport can get you to/from your car if it is anywhere near the trail, in almost all cases.
<<"The Jungfrauseems promising but I haven’t been able to find a specific trail that meets our desires.">>
Perhaps you could combine some of the shorter hikes. My favorite detailed list of hikes in the area has been stripped of data and made into "panels" for smartphones. Now useless.
Nonetheless, This map: will give you an overview of the region.
www.swissholidayco.com /Public/Assets/User/fi les/Map-of-Jungfrauregion1.jpg
Various maps will help understand the trails. Here is the best, most detailed, and complete:
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&X=16 2096.87&Y=638410.10&zo om=5
Color coding follows the convention:
There are others that can give information about the route of specific hikes, with altitude profiles at
map.wanderland.ch/?lang=de&route=all&bgLa yer=pk&resolution=50&X =623750&Y=162250&layer s=Wanderland
Search by place name, if you can't find a route from the map.
This is a useful document for the region. Kim is an experienced hiker:
One thing concerns me. You say that you are experienced hikers, but that you want what are basically mountain trails and hope to hike without boots or hiking staffs. I think your wishes are incompatible. The red trails demand boots or sturdy shoes with ankle support. Blue are technical hiking/climbing. In theory, yellow only require decent shoes, but my experience has been that many are rugged enough that light shoes are inadequate. Perhaps I misunderstand "basic hiking shoes."
Also, the Jungfrau region is car free, but that does not rule out your requirement about "place to park" since the transport network is dense and effective.
Hope you can make me wrong about equipment
Also, look here: