Some years ago, I followed a YouTuber who did exactly this and it turned out he had no end of reliability issues with the bearings, wheels, and frame because it

Some years ago, I followed a YouTuber who did exactly this and it turned out he had no end of reliability issues with the bearings, wheels, and frame because it turns out pedal-powered trikes just aren't built for the significantly higher speeds and weight of a motor-powered trike, especially when used for multi-mile trips as a daily commuter. Range was not great either, due to the extra weight of the wooden box he made to hold everything but the rest probably applies to many lower-end two-wheeled bikes too. I suspect this is the reason that most higher-end electric bikes more closely resemble electric motorcycles than bikes, in terms of wheel size and frame build.