Unfortunately your deployment will interfere with something to slot above your 5 iron. Besides the T250 there is also the T150, a U series driving iron, a hybrid, or a 7W.
No matter works for someone else, there is no reason that will be your best option. The safest/optimal solution is to get comfortable with your 5 iron and look at the distances between that and driver. A fitter can recommend a 4 iron based on the results with your 5 iron. You can also pick one of the other options as you can get fit for them and decide which meets your shot window and distance need.

I had exactly the same issue. I played AP1 irons for a very long time, basically the ultimate game improvement shovels, and recently had a fitting at Titleist in Munich.

I ended up going with the T150 from 7 iron to GW, and T250 in the 5 and 6 iron. My main issue was always a very low ball flight. With the T150 I’m finally getting a much higher launch, even though they are a bit shorter than my old AP1s. But honestly that is not really a problem, you just take one more club and gain much more control and consistency.

I currently play off 2.6, but when I was fitted for my AP1s my handicap was significantly higher, so my game has changed a lot since then. For me the combo setup was definitely the right choice.