pageant- | ssh ageant for windows | SSH Utils library

Is there a way in PS 5.1 to reuse the PuTTY agent keys?

Now, the details.

To use key agents one has an Agent that holds the keys (left box), and Client Applications that delegate administration of the keys (right box). E.g., client application C1=putty can use its own agent A1=pageant, of course. Client application C2=winscp knows how to use directly A1.

Certain Clients cannot use certain Agents directly, but there are Proxy agents that bridge the gap. For instance to use A1 with C3, I need Proxy P1=ssh-pageant, see example below. This helps centralizing in a single Agent the keys for many Clients. Now I mean to use A1 for all my Clients (currently, only missing A1-C5 and A1-C6).

Is there a way in PS 5.1 to reuse the same PuTTY agent keys? (I.e., a Proxy Px to use A1 with C5)

Possibly helpful: https://superuser.com/a/1173570/245595

NOTES:

1. I did not try it, but it seems like winssh-pageant is a Proxy to link A2 with Client applications that understand A1 directly.

2. I am currently trying to use in PS the same ssh-pageant from msys2 (it is a Windows program in the end, and often times they do work), manually replacing what eval does in msys2 (so far with no luck, but I think this is fixable):