Do I need another VPN?

Question

VPN

In general, the subject is how to organize access for a device with IP 10.0.1.1 to UR4.
Do I need another VPN or can NAT replace the IP? In general, how to organize it.
All routers in the Cisco diagram, except for UR1-Mikrotik

Answer 1

Why change that? And NAT is unnecessary.
It is enough to allow packets to go to UR2 and UR3, and set the appropriate route on them and on UR1

Answer 2

Raise OSPF/BGP/EIGRP and forget about such issues :)