here is what I am doing now :

[mkPinManagement]
; will need reload to cancel exten => 1,1,System(asterisk -rx "remove extension s@macro-pinsets")
; works also exten => 1,1,System(asterisk -rx "remove extension s@macro-pinsets 1" >/etc/asterisk/mike.txt)
exten => 1,1,System('asterisk -rx "add extension s,1,Goto,999 into macro-pinsets replace"')
exten => 1,n,Playback(custom/mkPinOff)
exten => 1,n,Hangup
;
;exten => 2,1,System(asterisk -rx "extensions reload")
exten => 2,1,System('asterisk -rx "add extension s,1,Goto,2 into macro-pinsets replace"')
exten => 2,n,Playback(custom/mkPinOn)
exten => 2,n,Hangup