Multiple (client-)peers with same keys possible ?

[reiner otto]

Is it possible somehow, to define multiple (client-)peers to share the same keys ?
(Trading some loss of security for simpler distribution)

I.e. on server:
[Interface]
ListenPort = 5000
PrivateKey = ABCD ...XYZ
Address=172.16.0.1

[Peer]
PublicKey = 1234...7890
AllowedIPs = 172.16.0.0/16


client1:
[Interface]
PrivateKey = top...secret
ListenPort = 5000
Address = 172.16.0.2
[Peer]
PublicKey = everybodyknows
AllowedIPs = 0.0.0.0/0
Endpoint = 1.2.3.4

client2:
[Interface]
PrivateKey = top...secret
ListenPort = 5000
Address = 172.16.0.3
[Peer]
PublicKey = everybodyknows
AllowedIPs = 0.0.0.0/0
Endpoint = 1.2.3.4
....
....
....