Roughly 2000 m vert gain in 80 km is very standard here abouts. It's actually what I usually get, once I ride such a distance. I find it's a njice balance of climbing, descending(!) and riding flat bits to relax.
On my last biggish ride (1148 km, 2800 m climbing) I had clocked 2100 m climbing on the first 55 km. All on Strava for those interested.
I just sketched a route, going by the rules
It's my backdoor, but I wouldn't want to ride it. Too much pushing uphill.
This is more of the kind I could possibly imagine riding. When I'd be feeling a bit stubborn:
From where I life the pre-Alps are 20 km away, the highest point being the Brienzer Rothorn at 2350 m with a super fun tech descent.
Within a 80 km bike ride I can get to the rideable Wildgärst with 2890 m (last visit by bike 10.5 years ago with a late mate, but we didn't ride to the base).
In these areas I could fit in 6500 - 7000 m climbing. So the question is, stay close and use the 1400 m hills, or go further, using precious distance but going for the big climbs/drops.
It ends up being roughly the same, so I'm not going to dig further, but this challenge has spawned a few good ideas.
On the Raetic Trail I remember a few segments with little distance but much climbing:
35 km, 2000 m climbing.
All in all it a bit more mellow with 5000 m climbing in 100 km. I deliberately added some extra flat sections.
Once the route choices lie in the main range of the Alps, 8000 - 9000 m could be done. Some of my bikepacking segments actually do see a 1/10 m ratio over more than 20 km.
)
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nice one Sean! Glad this pointless exercise had a point 
