make custom error override "default" chumsky error

[desert plinth]

im using a cumsky/logos combo to parse a file format, and i have some reserved keywords encoded in special tokens, and a token for a general name, and i want to give one special error for "reserved keyword". just now it says "found [keyword] expected something else" which isn't very helpful. so i tried to parse the different keywords as well, and then emit a Rich::custom message, but since the parser is a sub-parser, the message becomes "found [keyword] expected [name]/line ending/comment" etc. i want to propagate the error to "top level", is there any way to do that? basically, i want the "found reserved keyword" to overwrite any other error, rather than "found ... expected x/y/z" overriding it

my parser looks like

fn item<'a, I>() -> impl Parser<'a, I, Item, extra::Err<Rich<'a, Token>>>
where
    I: ValueInput<'a, Token = Token, Span = SimpleSpan>,
{
    select! (
        Token::Item(item) => item
    )
    .try_map(|item, span| Item::try_from(item).map_err(|e| Rich::custom(span, e)))
    .labelled("item")
}

(found no better way to select one token. note that Item::try_from is infallible in this context since it only fails on reserved keywords)

I changed my parser to

fn item<'a, I>() -> impl Parser<'a, I, Item, extra::Err<Rich<'a, Token>>>
where
    I: ValueInput<'a, Token = Token, Span = SimpleSpan>,
{
    enum R {
        Reserved,
        Item(Arc<str>)
    }
    select! (
        Token::Accepting => R::Reserved,
        Token::Item(item) => R::Item(item)
    )
    .try_map(|item, span| 
        match item {
            R::Reserved => {
                Err(Rich::custom(span, "Reserved keyword"))
            },
            R::Item(item) => Ok(Item::try_from(item).unwrap())
        }
    )
    .labelled("item")
}

which compiles and all, but the "reserved keyword" message gets overwritten when combining item() with other parsers (to something like "expected item or newline or comment)