OMG! --> RTFM! :-/
Thank you very much for your help @amachronic , and even more for your patience. Please excuse my ignorance I could have RTFM, but only skimmed through the forum article describing the installation on Sansa e200 series.
Thanks to your help AND the manual, I successfully installed the Rockbox daily build 2023-03-22 on my Sandisk Sansa e200v2. I'm using it with a 256GM microSD, with many audio books and music on it. Bookmarks and playlists with bookmarks per playlist now work as expected without any crash during the last two hours. Also I did install a few themes and fonts and played around with different settings just to test if there was something else forcing the crash on my previous installation. No crash or other issues so far.
Great work and big thanks dear Rockbox engineering team!