What is it you are wanting to do? Please be specific.
iTunes Match is associated with one Apple ID and one geographical Store. You can have up to 10 devices (computers and iOS devices) associated with an Apple ID for iTunes Match, automatic downloads, and re-downloading of past purchases. Once a device is associated with an Apple ID it cannot be associated with another Apple ID for 90 days. There is no getting around this. See this Apple KB artilcle for more information: http://support.apple.com/kb/HT4627?viewlocale=en_US&locale=en_US
Route A: Easiest route would be to combine all of your Songs in a single desktop iTunes library, perhaps in a Music account. From here make use of a single Apple Id for library and iphones - this will work, the question is does it meet your need?
Current Situ: The issue your current pattern of use hits, as Michael has shown, is that you are in danger of needing to support more than 1 Apple Id per device - this is simply not possible with the current Apple Service.
Route B: To create separate libraries would suggest that you use a further computer - you can than run 1 set of computer, iphone and iTunes Match subscription discrete from the other - this will also work - transfer of Songs between the libraries will work well via audio CD export / import at 256 kbit AAC.
Summary: In summary move from Current Situ to either Route A or B, pending your need.