"French pronunciation of a French word."

Never thought of that, but would make sense.
Which raises the issue: Should adopted foreign words/phrases be pronounced in their native tongue?
For example, Alex Trebek, a stickler for French pronunciation, pronounces Genre "Shoh-r" (which I prefer)
And then there's Sans (What would Alex do: "Sohh")

Hidden camera:
Americans mispronounce words at an exclusive Paris Bistro

https://www.youtube.com/watch?v=wmCWRTKJGgg

Should adopted foreign words/phrases be pronounced in their native tongue?

In my experience, apart from any degree of difficulty with tongue-twisters, it usually boils own to the commonality of the word's usage. Paris isn't 'Paree' for most English-speaking people, whereas timbre isn't a commonly used word for most people.

Just did this: entered Solder into Google translator and bought up Italian, then the sound icon: Their 'L' is silent, so US version maybe originated with Italian immigrants?

Oh I would not be to concerned of how you guys pronounce solder At all !!
Gosh,, you know the old saying about people in glass houses!!
Our accents down here are shocking.
How ya going mate! Where's me smokes!
Owwwww

https://youtu.be/GCSKD_pn2Rk

Rated G

Our accents down here are shocking.

To whom? I've never manged to shock anyone with mine.

BTW: They're a Weird Mob contains a great scene showing how house foundation footings were dug with pick and shovel back in the 1960's. I showed it to a retired Italian builder and he went out and bought a few copies on DVD to give to his grandchildren.

US version maybe originated with Italian immigrants?

"The word solder comes from the Middle English word soudur, via Old French solduree and soulder, from the Latin solidare."

On that basis, it would seem that the 'sodder' pronunciation may come from people still wedded to Middle English spellings. I guess a history of the plumbing trade in the USA might hold some clues.

Well you dont hear it so much where we live! But if you put a Saddle on your orse and head out a bit you will ear it mate! Hahaha

Plausible explanation, because Italian immigrants would've been disproportionately represented in the skilled trades.

Speaking of 'sodder', I was recently watching YouTube video of a guy in Tennessee with the typical southern drawl and he pronounces Z as 'zed' and solder as 'solder'.

Maybe the Confederate States were more closely aligned with the attitudes of the British than the others (possibly to aggravate the Unionists even more) and some of that carries over to the present day.