For anyone actually interested in using AutoHotKey to emulate the TextBlade, I've uploaded a new version that should work better than the previous. It also is run off Excel for defining the Hotkeys. If you don't have Excel, then it won't be much good to you (sorry). Use the new TextBladev2.ahk, which uses TextBlade.xlsx for the key definitions.
It is a reasonable experience, though difficult to implement in software with the whole multiple key press stuff and the need to have delays to try to correctly determine the intent of the user. I'm expecting the TextBlade experience to be far superior as they implement this inside the TB, before it reaches the OS.
For those interested, some of the chording just doesn't work on a traditional keyboard as it isn't able to recognise all of the keys pressing at once. The TB clearly doesn't suffer this issue. Example: I've not been able to use the standard TB function layer for the right half of the keyboard as it just won't allow holding the chord and hitting keys on that half of the keyboard. To handle this I created mirror versions of the chords on the left side of the keyboard for the two function layers.
The excel file allows you to create new layers as well. You define the layer in the "Layers" tab, then add the "Down" / "Up" key mappings in the "Keys" tab.
Wish I didn't need this stuff and just had the TextBlade instead. Hopefully @waytools aren't too far off releasing - fingers crossed for July...
For any willing/interested in giving this a go, enjoy.