Mapping Swedish character hotkeys in MacOS to Windows 10 - autohotkey

Question

I want to map the Swedish characters å,ä,ö,Å,Ä,Ö to the MacOS hotkeys, but I want it to work under Windows 10 since at work I use a Windows machine and I do not want to keep switching back and forth from a US to Swedish keyboard layout. I think Autohotkey will be appropriate for this.
The MacOS mappings are:
Option+a = å
Shift+Option+a = Å
Option + u, then a = ä
Option + u, then shift + A = Ä
Option + u, then o = ö
Option + u, then shift + O = Ö
Instead of using the option key in Windows (since it doesn't exist) I will use the Left Windows key.
So far I have the script:
#u::
Input Key, L1
if Key=a
{
Send, ä
}
if Key=o
{
Send, ö
}
return
#a::
Send, å
return
This works for the lowercase characters but I am not sure how to implement the upper case characters.

Answer 1

user3419297's answer didn't work for me but I was able to use parts of it to get the code to work properly. I have posted it below in case anyone is wondering how I was able to get it to work.
#u::
Input, Key, L1
if GetKeyState("LShift")
{
if Key=a
{
Send, Ä
}
if Key=o
{
Send, Ö
}
}
else
{
if Key=a
{
Send, ä
}
if Key=o
{
Send, ö
}
}
return
<#a:: Send, å
<#+a:: Send, Å