Technically, there is nothing barring a wet-lease operation in the IASC Determination. It cannot be used to jointly operate with another carrier, with the exception of the codeshare agreement with ANA, and anything else with approval from the Commission. It may be pushing it uphill to do so, but with the right arguments, anything is possible.
What I found interesting is that it is in the public record that Virgin provided the Commission in June with a confidential "firm commercial" plan to operate HND from Northern Summer 23 in order to preserve their slot allocation. Seems more likely to be a widebody wet-lease than a Max into FNQ, but stranger things have happened.