Oh My! That would indeed present me with a parking problem.
Please don't mention it to a single soul Paul...... but, a 4th 24" x 1&5/8" Unicycle Rim fell into a shopping basket near me today.
I just don't know how it happened.
Some additional small (25mm) tube has fallen into my eBay basket for the construction of that Delta/Quad back-end drive unit.
These would form the "hooped" bracing that hold the 2 halves of the axle in alignment when you cut away the centre section to insert the 2WD unit.
I have chosen fairly sturdy 2mm walled tube for this.