greetings from Colorado :-D
I don't have the answer to your question, but if in my internet travels I come across any good ideas I will send them on to you.
I will bookmark your topic page-

you can buy a magnetic seam guide to put on your machine to help keep your seems accurate or you can put tape on your machine and even put a few layers on to build it up to help keep it where it needs to go.

Thank you to everyone for their suggestions and warm greetings! :)