You wouldnt do well on RAGBRAI.
All seriousness-
- lean your bike against the wall first and have someone put their bike over yours.
- get an extremely thin and small cable thats big enought to wrap from the seat tube thru the rear wheel. Like a saddle leash that people use who are afraid their saddle will be jacked.
https://www.rei.com/product/832897/o...UaAptEEALw_wcB
good luck with the idea of feeling more comfortable.