Trying to purchase my first ROO in boutique

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Hello experts, I need some advices.

I plan to purchase my first AP (26420)this year and start build relationship with boutique in September. I stop by several times to chat with the SA about my self and received some positive feedback. But I still want here some advices from you guys. Is that possible to purchase the 26420 without purchase history? If it's impossible, I will not awast my time at boutique and try find one in gray market. Do you think I still have chance to purchase the watch at this year? It's almost December and I'm not sure the boutique will receive another shipment, so please let me know if anyone have the experience! Thanks!!!!