Now mix in other language speakers pronouncing the English acronyms but while speaking their language.

Ask a German speaker to say CLI. Probably comes out something like "clee". With the C like in "corn". C makes that hard German K sound.

Depends on where in Germany. In the west most pronounce it like K. Like the the word China is pronounce Kina with a hard K. In east and north it is pronounced like a german sch like Schina. The c together with a k like in „backen“ or „lecker“ just sounds like a second „k“ („lek-ker“)

I and my colleagues all pronounce CLI the English way btw. But growing up I had a hard time with the word „cache“. I pronounced it the German way which sounded very silly.

What's wrong with a "Kesch" (er)? :)

OH you mean a "Kache" (l)?

On a related note I find both "Kina" and "Schina" sound weird. It's "China". Like in "ich".

Yes I pronounced it „Kache“. Didn‘t know better ;)

Actually it's french. Therefore "Kaschee". Nix mit Käsch inne Täsch :-)

Similar thing with Budget. Up to this day my toenails roll up when I hear it pronounced like "Badd(dj/g)ätt" instead of "Bü(dj/g)ee".

how do you talk (like actual voice not text exchange) about it otherwise?

I spell it out every time. "The C-L-I flag does foo"