I figured out the repeater issue I was having. Radios were too close to each other. So long as I'm not holding hands with the person I'm talking to everything is fine.
I'll preface this: I take no responsibility if you brick/break your radio. I do not know the legal ramifications and accept no responsibility there either. I recommend AGAINST doing this. Misconfiguration in this manner may TX on freqs you aren't allowed to, which is illegal. It's up to you to confirm the TX freq before pushing it to your radio.
I reached out to Radioddity regarding additional GMRS TX channels and they did say it's in the works, so there's an official patch on the way which sounds like it will allow TX on all channels in the radio. Would be best to wait for that in my opinion.
If through all that you still want to go the backdoor route of programming additional TX channels, read on.
If you activate Developer mode in Chirp, you gain the ability to add TX channels via the 3rd tab labeled "Browser". From there navigate to root>memory, each one of these is a stored channel. The "txfreq" value is what you want to adjust. Set to whatever the "rxfreq" value is +500000, that will put the TX at a +5MHz offset. After you do this you cannot change anything on the normal Memories tab or it resets all channels "txfreq" above 30 to 166666665 which disables TX.
Alternatively, there's a developer module in one of the Chirp bugs you can load which treats the UV-5X as a UV-5R, allowing you to write whatever values you want to the normal Memories tab. I think this method will disappear as it allows setting TX frequencies outside of the GMRS approved freqs very easily. The other method does as well, but it's a diag mode and is super clunky to use.
Still trying to figure out how to enable TX in VFO mode. But that's honestly less important so long as I can save values to memory channels I'm happy.
Again, the above is at your own risk. You may break or explode your radio, I have not tested the entirety so ramifications are unknown. So far as I know, neither Radioddity not Chirp approve of doing this. So you might void the warranty on your device as they may not be designed to operate in this fashion.