If any valid legal defense exists then Trump has a right for the jury to consider it.
I agree an interlocutory appeal would delay things, not clear exactly how long.
Smith is running out of time on this one.
I believe that Smith does not have a right to an interlocutory appeal but would have to seek a writ of mandamus. That has a high bar in that it requires a showing that the trial court violated a clear duty that has no element of discretion.