Welcome to the forum perhaps you should check the audio and electronics section in this forum to determine if anyone has tried to do what you are asking and if the wiring for the nav system is part of the non-nav ex-l model so you wouldn’t have to add additional wiring I hope this helps
Both my cars have factory nav but I use my phone more. Dont have to pay to update it every year and can change addresses while driving. The only real benefit is if you live in an area with poor cell reception the gps is used
Nav and non-Nav are highly different in terms of modules present, wiring, etc. You need to replace pretty much entire center stack (climate controls, display, trim to accommodate it). Unless you have EX-L with factory RES, you need to install the OEM amplifier. Many harnesses are different. Fuse boxes are different. If you have an RES and there is an OEM amplifier, it makes things a bit easier. If you have access to a junked EX-L Nav or Touring that you can rip for components, it is doable, but still a major amount of work. The biggest issue, however, is that for all that expense and effort, you are getting a very limited and grossly outdated system.
Honda Pilot Aftermarket Navigation Car Stereo has a 7 inch touch screen, it comes with refitting frame which matches original dashboard perfectly. It is designed to replace stock radio system(non-navi), totally plug and play, no gap installation, no need cut wires, free gps navigation map preloaded.
But those are a bit of a dark horse in terms of support.