InTokyo

I'm intent on starting to learn some basic trials moves. I never rode BMX or skated; did a bit of MTB back in the nineties, now commute by road bike so have basic fitness (ride 150km a week on average), 6'2, 83kgs. I live in Japan where everything seems extortionate as far as bikes go; to date I've seen zero trials bikes on sale though today spotted a bare frame of MBK T-1000 for a stunning JPY36k.....was thinking that maybe I could start on a BMX - is that a possibility? Sure I'd love to order something brand spanking from Tarty Bikes but usually skint, so a cheap crappy BMX might suffice for a novice? Any other advice or tips? Cheers