iwander_lust

1 - you'll only use the anamorphic part. You have it unscrew the back lens and use your own taking lens so it doesn't matter.
2 - not sure
3 - only buy an isco if you can get a cheap one. Like €150/200. They are pretty heavy and cumbersome to use, although they are pretty sharp.

I'd suggest searching for a smaller Kowa. The prices can get pretty high but if you are lucky maybe you can find a good one for about €300.

Also, if you do go the isco route, check the pictures of the lens barrel! Some focus to 5 feet and some only focus to 15 feet.