Here is a link to the original approach that I believe you are discussing:

Diesel Particulate Filter (DTF) - Bimmerfest - BMW Forums

See post number 9 for a discussion and picture of how lpcapital forced the regeneration.

Hope that's helpful. Good luck.

__________________
Stephen
2010 e70 35d- now driven by son #2
2005 e53 3.0 - now driven by son #1
2021 G05 45e PHEV - now driven by me
2008 ML320 CDI - driven by wife