You can simply repack E01 archives to ARJ using the ARJ program, or any other file manager that supports both formats.
Convert ARJ auto-extractable archive to ARJ Compressed archive.
We have found one software suitable in our database for this conversion.
Microsoft MS-DOS software - convert e01 to arj on MS-DOS
Once very popular file archiver for MS-DOS
Convert from e01 file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.