By 2035 (13 years from now), a ban might not even be necessary. At the rate the technology and infrastructure are advancing and costs are coming down, it’s possible that no one in their right mind would buy an ICE bike anyway. Just think about what was available 13 years ago in 2009 and how far we’ve come! Even if battery capacity only expands 4% / year, that would give us ~70% better density, so >200 mi highway range for a bike like the Experia with no improvements to mechanical, rolling, or aerodynamic efficiency. 15 min recharges to 80% are already possible with today’s cells, and just need liquid cooling to be realized, so in 13 years the charging could be so fast and convenient that gas has no practical advantage. Cells have been getting cheaper by about 7% / year IIRC, so compounded over 13 years, the purchase price advantage of ICE bikes will also evaporate, except perhaps in the segment for capable bargains like the MT-07 and SV-650, but even there the 5-year cost of ownership would by sky high compared to electric.
Motorcycles may be about 7 years behind cars on the adoption curve, but once no one is buying ICE cars in developed countries, gas stations will start going out of business. By 2035, there might be so few stations left that it doesn’t make sense to own an ICE bike, even if e-bikes with DCFC and powerful motors haven’t quite hit the sub-$10k segment.