Setup a single Mikrotik Router who does only VPN

Hello,
hope you are all fine.
I am wondering, if you can tell me if this possible.

I have a well working network enviroment.
I am thinking about to run a mikrotik as a client in a network.
I would like to make a portforwarding from the main router to this single mikrotik.
And this mikrotik should be accessable via VPN and of course I want somehow to connect to my network.
Any ideas if this can work?

Thanks for your help in advance.
Greats kupfistanton

Easy to do, why not do it on the main router. Do you have a network diagram to share?
Also is the WANIP on the upstream router publicly accessible??

Yes, it can.