Best vintage rear derailleur (thats fairly easily available) for friction

How about one of these. A secondary pivot to keep the top jockey close to the cogs. It’s shimano’s Huret copy, popular before indexing. IMG_0323.jpeg
 
I'm going to suggest SunTour Cyclone II GT

I'm using one for 52/36 + 13-32: max cog 32, wrap 35
but the spec is max cog 34. wrap 34. weight 172g
https://velobase.com/ViewComponent.aspx?ID=374d02a0-8e7d-43fd-8ae3-a04877256f81&Enum=108

You can get it to do 8 speed cassette but you may need to file down one of the stops a bit - I've made a wheelset that does that.
So it will probably handle 9 or 10 as I think they're the same width (but I could be wrong).
 
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