Advice for heat exchanger on Rocket Mass Heater, new baby daughters room

Hi rocket engineers


So i need some ideas and thoughts and thought i would put the question out there.

This is the current situation.
Last year i built a RMH on my Dutch Barge. The barge is a steel ship built in 1903.

The stove uses a Peter Van der Berg batch stove, combined with a Matt Walker stratification bench.
The build and images are on Instagram for those who would like to see.

Without going into to much detail on the stove I have a new challenge where i would like to share ideas.

There is a new crew member, a baby girl.
I have been over the past nine months converting a room previously a office or storage into a bedroom.
We have spray foam insultation, being that it is arguably the best choice for ships.

The task that lies before me is heating that room.

Our boat is fitting with the RMH but when we moved onboard there was a Diesel CV.
We have had to use the CV with the new born.

The new bedroom is positioned at the stern of the ship (back)
Between the Living room and new bedroom is the engine room. Zero insulation. The heat from the RMH cannot reach the new bedroom.

I have been thinking of two things to do.

A heat exchager with coil in the RMH bell or chimney. With anti freeze to a radiator in the back room. Perhaps this needs to be an open system to deal with expansion.

I was also considing somehow conecting the existing CV with a heat coil inorder to warm the radiators throughout the ship. But this is quite advanced and expensive if wrongly done. Not to mention dangerous. But i am open to challenges.

The question: how can i bring heat from RMH to a seperate non conected loving space.

I hope by posting this i might hear your expert advice and insights.

Www.instagram.com/devooruitgangboot

This is the Diesel CV. We heat water and CV when required, but we want to get off this as much as possible.

Was thinking of something like this