Hi soreshoulders,
The Roma is certainly a great quality/value choice and is well worth considering and if you need or prefer a softer sleeping surface then an additional topper could also be a good idea.
I would just make sure you talk with them first if you are planning on adding a topper so that they can give you some guidance about how the combination may work for you … at least based on “averages”. In most cases where someone is considering a mattress / topper combination I would suggest that they try the mattress first and then add a topper using the topper guidelines here and their sleeping experience on the mattress as a reference but if your conversation with them clearly indicates that you would likely be better off starting with a softer surface then adding the topper at the same time may be a good option.
The Roma would certainly be costly to return because it would need to be shipped truck freight but it could also be a very good base for a topper and returning or exchanging the topper would be much easier and less costly because it can be shipped by courier (although it would still be more costly from Alaska).
Phoenix