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Hi Moshjoshuk,
Can I suggest that a simple tension device on 1 or 2 wheels would suffice. I have modified several of these devices for my grandchildren and that works fine. Once they have their balance a bit better you can then remove it or reduce the tension. I use a piece of brake pad from a push bike mounted on a pivot with adjustable tension. While you designs are quite good, as an engineer it is common to see people over design and complicate simple challenges in design. Just remember the KISS principle is usually the best. (Keep It Simple St###d). I train all my students/apprentice this way.