Hello @Jmullins513
Using Sendkeys, you can send the combination of keystrokes.
In your case, to use Alt key -> Select the Insert Modifier and enter the keys as shown below:

The syntax can be {Alt}({H}{I}) or {Alt}(HI)
If this post helps, then please Accept it as the solution to help the other members find it more quickly.
Regards,
Shalini M