Nope. Neither can ź, ć, ś, ą or ę. You can, and people do write them as z, c, s, a and e when writing in a restriced character set, but that is not 'correct' and is not a bijection, ie. „półka” and „polka” mean two different things.
There's also the case of technically-same-sounding-especially-recently ż/rz and ó/u (whose replacement would let you get rid of two 'non standard' characters), but for historical reasons these are not interchangeable.
According to one of my employees (Polish) Ł sounds roughly like w as in win or water but not as in what. A quick read of this: https://en.wikipedia.org/wiki/%C5%81 doesn't help too much.
Does enforcing Ł instead of say w cause your written language to fail in some way? I don't want to cause offense, I want to understand the causes of difference.
If you wanna change that, you might as well change the entire writing system of the language, eg. to be more in line with some other, more common writing system (ie. other latin alphabets or the cyrillic alphabet which would probably make the most sense phonetically). But no-one's gonna go for that any time soon.
I think we have found the disconnect: you quite happily use a word like "wanna" which is nonsense in English. Its allowed because it is understandable. Wanna is "want to".
Ooh, "gonna": That'll be "going to".
What's gonna to you is l bar for me or vice versa or something 8)
What's the difference?
For more detailed explanation: https://en.wikipedia.org/wiki/Pronunciation_of_English_%E2%9...