i used to facing the same problem like you as well..

go to lowyat 4th floor, there is a shop name start with Midixxxx (forgot the full name though)

they have all kinds of audio cables and jacks. ask for the converter like what necromanser mentioned, but it is female to female jack instead of female to male.

so your speaker cable can plug to the converter instead of the converter plug directly to your speaker. speaker cable length+ 360 output cable length is enough for you to connect both Monitor and Speaker separately.

if they don't have it, you can ask them to customize it for you, cost you less than RM20 for sure.