sounds I can't find!!!

I'm putting together a table for Vistulan that indicates all the sounds for
the language in IPA using CXS.

In either case I don't remember how to get a few of the sounds that I'm
using.

Can someone tell me how to write the following sounds in CXS?

Consonants
c+hacek

n+tilde
I believe that the above would be
nj
but I'm not sure.

If I'm correct then the other sound I'm looking for would be analagous to
n+tilde only it would be m+tilde which would no doubt then be
mj
but again... I'm not sure.

Now for the tougher ones, vowel sounds.

I realize that no two languages say sounds exactly the same. For that
matter, I also realize that sounds will vary, oft times greatly, between
regions. Bearing that in mind, how do I represent

German 'au' or similarly Portuguese 'ao'

the sound in north American English

i as in kite, flight, or German 'ei'

oi as in north American English soil, spoil German 'eu'

As I'm an amateur linguist, I'm doing the best I can to represent the sounds
that I need based on the resources I have available to me.

Any help would be appreciated.

Scotto

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