Well, i can be possible, but not with Chip memory, it can have 2mb of Chip + 8mb of Fast Ram, total memory 10mb, but A1200 was designed to have up to 8mb of chip, but commodore decrease for reduce production costs to 2mb, for this reason you can set chip memory to 8mb on WinUAE, i'm not sure but i think that i read somewhere.
And as you can see on my signature i have an A1200 with a Blizzard 1230 with 50 Mb of ram, 2mb of chip and 48 of fast ram, using SCSI board for your Blizzard you can plug two memory simms.