Any political committee can change its own rules of its own accord at anytime. If the national committee agrees to seat delegates after they are stripped from a state, the committee may do so. There are consequences, of course. If any exception is made once, others will have to be made in the future.
If they have been stripped than they should not be allowed to be seated because they should be considered incompetent and disregarded altogether. If they were going to seat them then they should not have stripped them in the first place so they should be more sure of themselves next time around.