Please post a picture showing your network diagram. At least to me your initial question is confusing in regards to layout, and a routing question is hard to answer without a clear layout
You can remove the first router in the diagram and reconfigure MikroTik with the same IP configuration, or you can create a different network between router and MikroTik and route your public /27 network through MikroTik. It’s a simple task if you know how to reconfigure your router.