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Hi nidud,
Maybe it may not meet all your requirements but you can check Lzasm :
http://www.phatcode.net/downloads.php?id=308
I remember a project that is tasm/masm/nasm compatible, but has not been tested on ms-dos, maybe you can try.
Appears to me that this project is freezed, not sure.
http://popasm.sourceforge.net/
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Checking the site of PopAsm, they don't provide any download for this tool.
Hello Sir Vortex;
try the link below; I was not able to compile it because I'm not good with C, the only language that I learned alone was assembly.
The author does not updated that page posted before, tarball.
http://popasm.cvs.sourceforge.net/viewvc/popasm/