The Layout Spellchecker uses Win 8's cross-app built-in Spellchecker.
So a Win 7 equivalent is not possible as that OS has no built-in Spellchecker.
However, I have Win 7 AND I have Spellchecking/Auto-correction in all apps - including Layout AND SketchUp !
This is done using an AutoHotKey tool.
I have actually made it into an exe which then auto-loads from the Startup folder as Win 7 starts.
Then in any app, as I type it is checked and corrected.
I can add new rules using Win_H key combo...
This page explains details and links of to download the ZIP...
http://www.howtogeek.com/howto/45068/how-to-get-spelling-autocorrect-across-all-applications-on-your-system/
The AutoHotKey main page itself:
http://www.autohotkey.com/
There are other similar 'Spellcheck' tools in AHK too, but I just like this one...
P