Does anyone know 32-bit applications that are standalone?
Just find a program and try it. That's what I did. If you want to get tricky, Installation files of Malwarebytes Antimalware, Junkware Removal Tool, TDSSKiller and other programs that are supposed to find malware can actually be used by Shellter to create it and not be detected by any of them.
Another thing you can do is follow my guide to create your own exe file. Either skip the domain name part, or try it if you want. https://null-byte.wonderhowto.com/how-to/create-undetectable-trojan-using-domain-name-0171563/