this is so cute you did a teriffic job on your wallet I always have trouble with zippers I avoid them when ever possible.You said you have a Brenina you can slide off your plastic table and use your free arm I have a clear piecing foot I use all the time so I can see where I am with this foot you also have the ability to change needle positions with
your machine to make it closer to edge .just a few thoughts
hope this helps I have a new Bernina also so still in learning mode but wow what a great machine and fun to play with