"So far, I found out that the Canadian part manager said the stalk will not work on our Z because the their stalk only work for Canadian BCM module."
That is an incorrect dealer statement (not surprising). The BCMs, left body wiring harness and main wiring harness change almost every year, but the control
stalk remains the same part number. In 2010, the USDM and MEXDM BCM part numbers matched. Basically, if you have the rear fog light wiring in your left body wiring harness, it should work.
2011 USDM (base)
wire harness, main: 24010-1TH0A
wire harness, left body: 24014-1TG0A
controller assy-BCM: 284B1-1ET6C
switch assy-combo (stalk): 25560-9N00B (this is the same stalk that CADM NISMO receive)
2011 CADM (base)
wire harness, main: 24010-1TH0A
wire harness, left body: 24014-1TG0A
controller assy-BCM: 284B1-1EJ5D
switch assy-combo (stalk): 25560-1EA0C
2011 MEXDM (touring, no base avail)
wire harness, main: 24010-1EZ0A
wire harness, left body: 24014-1EH0B
controller assy-BCM: 284B1-1EA5D
switch assy-combo (stalk): 25560-1EA0C
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US stalk: 25560-9N00B (lame USDM) $170
Canada/Mexico stalk: 25560-1EA0C (no rear wiper)
Arabian/Argentinian/Brazilian stalk: 25560-1EL0B (with rear wiper)
Euro stalk: 25560-1EL5A (daytime running lights; no rear wiper)
Euro stalk: 25560-1HA7A (daytime running lights; with rear wiper)
Japan stalk: 25560-1EP0B (RHD yo!)