How to: Left & Right Alt and Shift always pressed?

So this has to do with my previous post about a Auto Hot key script I'm using
How to work around Windows' restricted characters — mythofechelon

So for this to work, you need to either hold left or right Alt keys :
To make a Unicode ? mark, I have to Hold right Alt. Naturally also have to hold any Shift.
Then the question mark key. So too many keys to press.

To make this special colon : need to hold Left Alt, and then hold any Shift.
Not sure why the AutoHotkey is set up this way, to have to press left or right alt to trigger different characters.

So is there a way to increase productivity by having left right alt and shift is always down, when i want to do a question mark, colon, etc ? Meaning just press one key, to make ? : etc
If there is something in the script ,that can be changed, i would not know. Or can I just another software to change the behavior to allow all these keys to act as one key press ?

Hope this made sense thanks .

Potentially you could define any key combination you choose (that's available without affecting one you might use in a given context) to launch 'SendInput'

As you can see the key combo (hotkeys) are defined before ::

It might be you can find a way to use this free program:
Universal single-key accenting for Windows and Javascript
file:///C:/Program%20Files%20(x86)/Utilities/AX/AXen.htm

Normally it's used to adapt a just-typed character to produce an accented form of it by pressing a certain key (which you can select).

E.g.
ß ö
- there I hit s then F8, o then F8

But you can create your own 'character set'.
Perhaps that set could be your Unicode characters...