'Special' Wireguard setup question

[MarkusI]

Hey,

I am a bit lost after trying different things and I do not 100% understand the settings and specific wireguard restrictions.
On the ASUS website, I found the following description of how to configure Wireguard VPN: https://www.asus.com/support/faq/1048281/

Basically, I have a local and remote AX88U-PRO, my local one running on latest Merlin and the remote one on latest stock firmware.
Unfortunately, I cannot reach the remote router from WAN side, which is why I need it to connect to my local one.

What I want to achieve is:

• there will be several VPN clients (10.6.0.x)
• all VPN clients shall be able to access one specific VPN client's (10.6.0.2) internal LAN (192.168.10.x) [this is the remote AX88U-PRO on stock firmware]
• No VPN client must have access to the server's LAN (192.168.1.x), nor to the server-router's IP (192.168.1.1) [my local AX88U-PRO with Merlin firmware]
• From my local server LAN, all clients of the 192.168.10.x-LAN shall be reachable

I know, this is a weird setup...

I basically have this running with OpenVPN already, but I would like to switch to Wireguard.
In OpenVPN, I am basically working with fixed client VPN IPs, assigning the remote LAN IP range to my remote router when connecting and restricting clients access to internet only.

Any idea or hint how to configure the clients and the server in order to achieve this is very much appreciated.

Thanks a lot in advance
Markus