It’s been recently said a few times on here now that Unis who use the LNAT do not, or are v v unlikely, to have places in clearing so it’s a moot point. They didn’t this year or last year. They really are oversubscribed.
There was ‘Adjustment’ where you could trade up if you had better grades than you thought, but UCAS did away with it this year & said it won’t be coming back. Bristol apparently did take someone in this scheme who didn’t have LNAT last year, but that’s just something I’ve read and certainly haven’t seen proof of. So again, is a moot point.
I think if you want to apply to LNAT unis you need to sit it as part of your application & apply then. Or, if you do better in your results, take a gap year, apply the next year & take the LNAT then.