Seeing as how most of your posts are all about how to kludge together stuff the wrong way due to an apparent dumpster-dive's worth of parts availability, and an unwillingness to purchase new/correct parts.

I'm going to suggest a solution that involves spending $$money$$.

the Surly Hurdy Gurdy device is specifically meant to prevent forward facing horizontal dropout slippage.
It addresses your issue.
see here:
A Side of Hurdy Gurdy with Your Cross-Check | Blog | Surly Bikes