You can get an adapter. There may even be some available here on audiogon. Do a search. If not, PartsExpress.com.
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Of course it's feasible and you'll find such products offered by many manufacturers, including myself. For a pseudo-balanced connection like this, make sure that the core of the cable is the same as a standard RCA cable - not balanced!
There is a problem how to terminate the unused pin on the XLR connector. consult with the manufacturer, but in any case do not short it to ground!
I think you need more info about the Meridian outputs. I doubt that a manufacturer would use XLR a connector for a single-ended signal, although this can be done. If that is true you need an appropriately wired RCA on the other end of the interconnect.
I think that what you may have in the Meridian is a "quasi-balanced" output. The (+) signal pin is active, but the (-) pin just has a resistor so that its output impedance is the same as the (+) pin. Such an interface when connected to a balanced (active) input circuit will exhibit the same noise imunity as a "true" balanced interface where both (+) and (-) signals are active. If this is the case you should use a regular balanced interconnect.