Disregarding any toxic responses, creating a fan port is certainly feasible. However, the challenge lies in finding someone who is interested in undertaking the project. Doom was relatively easy to port because its age and low power requirements make it compatible with various consoles. All the "Doom on XXX" ports function well on powerful processors that can handle the game effortlessly. In contrast, if you examine the Doom "ports" for less powerful systems, such as the Commodore 64, you'll find that true porting is simply not possible, leading developers to recreate the game instead.
The situation is different with Hello Neighbor. If the engine can be ported, then there is a foundation to build upon. Many elements could be reworked to function on at least the n3DS, but at that point, it would no longer be just a "port"; it would essentially be a remake. To be honest, I don't foresee this happening unless you take on the project yourself, especially since the Switch version already exists and the game isn't as overwhelmingly popular as others, like Portal.