Several years ago I needed 32bit standalone package. The way it worked for me:
1. Download and install Java 8 32bit on PC where B4J is installed.
2. Add this to #Region Project Attributes (change the path to where Java 8 is installed):
#JavaCompilerPath: 8, C:\java\jdk1.8.0_291\bin\javac.exe
3. Run in Release mode to generate jar file.
4. Use Launch4J to make standalone package. Here is the
tutorial (press Spoiler button to see it).
On 32bit old Linux PC I was able to run this jar file using Liberica Java 8 32bit JRE for Linux.