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Pretty sure you have been misinformed unless I am missing something.
Displacement has always been up to up to 125cc (age dependant)
Power up to 11KW or 14.75 BHPI know DT and RS125s can go over this for example but you can still restrict them. Nothing stopping you doing a CBT on their restricted 125 and then buying a derestricted bike.
Even more perfect is that an MZ TS125 is only 11BHP with options of tuning plus 'cough' the 150cc will go straight in 'cough'
3K will get you a lot of bike if you look around. Two strokes will get you more power for displacement as well.
RS125
DT125
MZ TS125
Grom
Fantic
XL
So much choice. I would personally avoid the cheaper Chinese brands selling bikes that appeal for their appearance rather than performance.