Choose specific port for connection

[MijnheerD]

Is your feature request related to a problem? Please describe.
I am trying to use this plugin for connecting to a computing cluster which does not have the latest software. Specifically, is has GLIBC version 2.17, which makes the install crash when trying to execute "free_port_finder.lua" with the following error (replaced specific user directory with dots for privacy reasons):

Command: .../.remote-nvim/nvim-downloads/v0.10.0/bin/nvim -l .../.remote-nvim/scripts/free_port_finder.lua

.../.remote-nvim/nvim-downloads/v0.10.0/bin/nvim: /lib64/libc.so.6: version `GLIBC_2.28' not found (required by .../.remote-nvim/nvim-downloads/v0.10.0/bin/nvim)
.../.remote-nvim/nvim-downloads/v0.10.0/bin/nvim: /lib64/libm.so.6: version `GLIBC_2.29' not found (required by .../.remote-nvim/nvim-downloads/v0.10.0/bin/nvim)

Also, for security reasons most ports are blocked on the cluster. I can open an SSH tunnel on a specific port, so ideally I would use that one for the remote session.

Describe the solution you'd like
A way to skip this step and just choose a specific port.

Describe alternatives you've considered
I have tried to install a higher version of GLIBC, but this requires (amongst other things) a newer version of make, and without admin rights this is quite the hassle.