Hello,
About the kickstart version: you'll need one that supports drives bigger than 4GB, or you won't be able to access all partitions of AGS. It will boot, but won't access the games
So original kickstart ROM 3.0 or 3.1 won't do, you will need either a newer 3.2.x, or a modified 3.1 with a fixed scsi.device .
If you have an accelerator with MapROM functionality (like a Blizzard IV), then you can keep the original ROM. This requires modifying the AGS image in WinUAE: you need to modify its startup sequence to make it load the new kickstart from a file and reboot.
And as for a PCMCIA IDE adapter, the big disadvantage is that you cannot boot from it, you will need to prepare a floppy for that.
Cheers!
