While it would be nice for Obihai to do what you are asking, it would be an extremely complicated process as there are at least 50 ITSP's out there that you could use with an Obi. And of those 50, they each have at least 4 plans to choose from and even more options you can add to those plans. The permutations are huge.
Furthermore, if Obihai were to list a select few, they would risk offending the others who Obihai depends on to drive demand for their product especially now that GV is changing.
I hate to say it but you are on your own to research this. There is lots of competition for your business so you should be able to get a great deal. Just make sure you are happy with the new provider before you port your GV number into them.