I've lowered tonnes of bikes for new riders, trick is to do both front & rear ends equally. While it introduces some compromises such as reduced ground-clearance and quicker steering (due to decreased trail), beginners aren't going to notice or be affected by that since they are so far from limits of bike. Being able to sit comfortably really helps them learn easier and faster simply from less mental stress about tipping over.
Another thing I've done is customize seat-shape. Banana seats are easiest as you can just remove cover and shave off foam. Narrowing front of seat into triangular shape allows for more straight-legged aim towards ground, less bow-leggedness. On some bikes, I've taken close to 2" of foam off.
Just one inch makes big difference
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