Hi,
You can also use a Micronik 3way rom adapter. By using this item you can insert your old kicks and use the 1200 3.1 kickroms too.
Work nicely and i also have the same config like you. But beware that if you put in an extra ramcard etc. you might get problems with the maximum RAM of 8mb. So you have to put your memory of the GVP in a higher ram space.
Just look in the forum i asked the question before too.
Greetings Henk