It's very common that everyone has MPF. Your employer is being cheap, and I'm not sure if there are account opening fees or what not but I always feel that employers drop the ball on opening mpf accounts. They wait to the last minute.
How it usually worked for me and I'm not sure if it is correct or not. The first 2-3 months you get your full salary. When 3 months come, the employer opens mpf and deposits 1500xboth sides so 3000x 3 = 9000. So usually they pay the first 9000 then start deducting me from the 4th month.
Not sure if this is the proper way or not but I've had it happen every time.
Another note that the employee has a responsibility to have mpf, I believe, if you earn over the minimum threshold salary, think it's $6,xxx. So who's responsible to ensure you are in compliance. I would hate to have to prove my case in HK because it isn't transparent and practically everyone has MPF. Why are you so special....
And another note, it's 3000/month towards retirement. You pay 1500. What's wrong with that