Upgrading from 300G Console?

I've got an old Aeris 300G console which includes the SPG and compass and was wondering if there's an upgrade path (either through Aeris or on my own) to replace the computer with a later version. My backup computer is an Aeris Atmos 2 so I'd be happy to use that instead but would still need the SPG and compass from the console.

Is there a way to either put the Atmos 2 into the console in place of the 300G or does Aeris offer any kind of update/upgrade pricing?

I guess, I could always get an entire new console but the new consoles all seem to be of the vertical variety and I like the horizontal placement of this one.

Thanks.