Adding a single space to 'isk' but not multiple spaces?

Using ledger(1) for finances, fields are usually delimited by runs
of 2+ spaces (or a tab), allowing a single space in the account-name.
So I might have a transaction like

2024-012-31 ! Groceries
Expenses:Household:Groceries:Food Lion $18.43
Liabilities:Credit Card:Visa -$18.43

(note the 2+ space indent and the 2+ space separation between the
account and the amount, while the single space in "Food Lion" and
"Credit Card")

It would be awfully handy to have colons and single-spaces be part
of 'isk' so that i_CTRL-N and i_CTRL-P can find full accounts (even
if they contain the occasional space), but that starts causing weird
issues (Vim really doesn't like having space in 'isk')

I've tried i_CTRL-X_CTRL-L to do whole-line completion but I have
enough transactions (and each amount regularly differs) that this
returns dozens or hundreds of matching lines, so it's less than useful.

Short of completely hijacking ^N/^P functionality to complete from
my known chart of accounts, is there a better solution I've overlooked?

Thanks!

-tim

(1) https://ledger-cli.org/



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