the 12a is classed as 1200cc in malaysia

any swap with larger capacity of the original motor, youll need to upgrade braking and suspensions systems, according to local RTD rules.
youll have to pay higher road taxes as well

road taxes are based on how big is your engine. meaning a guy whose driving mazda rx8 will only need to pay minimum roadtax compared to a15 guy in a vanette.

i'm running A14 + twin 40's mikuni in my datto and also an engine balancing to it..other than that is totally stock but it producing quite a decent power to me..

Yup,i agreed with u,for A series engine is hard to find/get their aftermarket/performance parts,but we still have other option to do that..no worry..
and yes,for complete A14/A15 + 5 speed gearbox it will cost u MYR1500-1800 (the same price with 12a motor here in malaysia)..
last time when i bought my A14 it cost me MYR650..

If u are hungry for power,i guess 12a is the perfect motor to fit into ur b110 ..i've checked the price with one of rotary specialist in KL/Selangor,
it will cost us MYR1600-1800 for complete rotary engine overhaulin' and plus another MYR2000-3000 to fit into ur car..
huge money involved here..but i do sure ur car will be one of the datto monster here!