Welp... I'll compromise and give you Drake.
I had actually pondered something along the lines of your suggestion maybe 6 months ago or so. I don't think it's necessarily that simple.
For one, while you may be able to reduce the size of all of the team names to allow the addition of more names, there may be more coding required to not only adjust the cursor size but also its movement. To do any of this, you need to decompress the Team Select screen, edit it (watching for any potentially shared tiles among teams), and then fit it into expanded ROM and point back to it versus the original compressed screen.
To illustrate, here's what I was working with just trying to update Seattle and New Jersey.
This also presumes all of the new teams can be selected. There are several areas in the ROM that consider that there are only 27 teams that are played against and only 29 playable teams (2 of which are swapped out... Rookies versus All-Stars... depending on if the 27 teams have been defeated or if a secret code has been entered).
Given the above, one viable fix to ensure all teams are represented is to combine them in some manner. In my case, to allow the player to use the 2018-19 All-Stars as a team upon defeating the 27 teams (campaign mode), I needed to triple up the expansion teams. But... I can't refer to them on the scoreboard as Expansions because the tile width can only be as large as it would for the word "Rookies". Same for the Team Select screen. "Rookies" and "Raptors" are both 7 letters, but "Rookies" will be smaller because of the width of the letter I, so for best fit, I need a term with 6 letters or less. And... Memphis and NOLA are still in the mix, so a group term is merited.
Hence... "Others". Now, on the Last Played screen, I can fit "Expansions", so I went this route.
I also made it a point to do the logo matchup to recognize each team and give them their due.
Now, the Champs do deserve their own slot, but I think you'll still enjoy playing with the likes of Leonard, Lowry, and Gasol. Plus, I've got Linsanity in the mix for fun and now have the team's ambassador available. Definitely consider giving it a shot when it comes out. You may still get a kick out of it and find it a good play. If you want to see something along similar lines, maybe take a look at either EMiller's 2K17 mod, or my Overtime version of it