Vision 2 on a Nizo Pro

Hello,

I will start shooting my first super 8 short next week and have a
couple of questions about the medium. I will be using a Nizo
Professional (with a Nizo 461 M as backup) with vision 2 film stock at
24 fps. I decided to go for Vision 2 negative stock because:

a: most of the film will take place either outside at sunrise or inside
a train in the early morning, so it will be relatively lowlight.
b: i heard, though i don't understand exactly why, that negative film
is more forgiving of exposure errors, and is better for telecine.

I will shoot tests of both 200t and 500t next week.
My question is:

1: Do I absolutly need an 85 daylight filter? Even on the train where
there is a mixture of artificial and dawnlight? And if so, do I need to
bore holes in the cartridges in order to release the internal daylight
filter in the Nizo Pro? I'd rather not have to buy an external 85
filter because i will also need a wide-angle lens in some of the train
scenes.

2: I know everyone says to use a seperate light meter, but I am a
beginner and would like to keep things as simple as possible on the
shoot. I understand from other posts that the nizo pro will read the
200T as 100ASA, if I take a reading from the internal light-meter, then
switch to manual and go up 1/2 an f-stop, will that work out as the
slightly over-exposed result which is supposed to be good for this
stock?

I very much hope someone out there knows the answers, or can point me
in a good direction, trying to find this stuff out via google just
leaves me more and more confused.

all the best,

joby