Not sure if I understand the actual complication. Are you saying that you’re unable to create the alignment targets due to the delay requirement?
If that’s the case then you can build any alignment targets that you like. It doesn’t need to be done during the alignment process.
- Create 4 targets where the centers of the targets are arranged at the corners of a 180 mm square. The size is very important.
- The targets should be numbered 1-4 clockwise starting from the top-left.
- Center the targets onto your workspace preserving size and orientation
- Now… you can scale the size of the square that defines the distance of the targets beyond 180mm to fill your bed but you need to track the relative scale increase so that you can enter that scale value in the Alignment tool. The alignment assumes the 180mm distance.
- Create the targets and then continue Alignment process
The target should look something like this. The specifics other than size and location of the targets don’t matter but I suggest you go with something high contrast.