Thats because N.hamata was new and people didnt realise it didnt grow at that extreme of an environment, but we do know that now. Vanilla has been around for a lot longer and to this day not one person has managed to achive what youre hoping to achieve.
Trust me, people have let it climb, they have tried to get it big, they have tried this, they have tried that, theyve tried loads of thigns but it just doesnt work. Heck, theres someone on the orchid forum who let theirs climb on the wall, but they arnt ever expecting flowers, they just say its fun to see it climb.
But the point is, no one has yet managed ot buy a Vanilla, put the pot on a windowsill and manage to get it huge and flower.
Its totally not true that few people havnt tried it, many have in the USA and Europe but no one has managed to accomplish it.
All I can say to you is good luck, but I am 100% adamant you wont be able to flower it. But good luck anyway.