Hey there,
Welcome to the community! Glad FEE3 got the word out about this hobby we get to share. FE hacking is a very cool little corner of the internet.
As for your question about commissioning a hack/forming a team, I will say that I have never heard of an entire hack being commissioned. It’s quite possible to commission individual elements (e.g. hiring an artist to make character sprites, hiring someone to code a certain alteration to the game engine for you), but if you want this project to become a reality, you’ll likely have to get your hands dirty and do at least a good portion of the hacking yourself. These are passion projects that often take years to complete, and while commissioning parts or bringing others onboard is possible, you will likely have to be the main driving force of the project for it to succeed.
Once you have made some progress and perhaps have screenshots or a playable demo, this can then be presented to the community and you’ll have a much better shot at getting people onboard with the project. People are much more willing to pitch in if they see some progress from a creator, showing that you are committed to the project and it has a future. I think your idea can definitely work as a romhack, but ideas are a dime a dozen around here for better or for worse - people like to see something tangible.
I feel like I have delivered some news you might not have wanted to hear here. But hopefully I can give you some good news: FE hacking has never been easier to learn and has never been more accessible than it is now, even for those with absolutely no background in this type of thing! If you want to tinker a bit with hacking yourself, here is a good place to start. This is a good resource that breaks down some of the tools of the trade.
Here is a link to the FEUniverse Discord server, the best place to find other hackers. This is hands-down the best place to get your hacking questions answered quickly, as there are dedicated channels to help enable you to get where you want to be. It’s also a great place to meet other hackers.
If you want to commission some work, here is a link to a thread where some users have advertised that they take commissions in certain areas. You’ll note that most of what’s advertised here is art commissions, as that’s what’s most commonly commissioned around these parts.
I hope I was able to answer some of your questions. Good luck to you, and I hope you’re able to enjoy dipping into the wide world of FE hacking.