No. A limit on the amount of deferrals for the HCE group would have to be done by plan amendment. The limit would have to be definitely determinable and not subject to employer discretion.
Being an amendment, the usual rules around amendments apply. SMM is needed, 411(d)(6) applies, etc.
There are 4 and only 4 ways that deferrals can be reclassified as catch-up. Those are:
Exceed the 402(g) limit
Exceed the 415(c) limit
Exceed a plan-imposed limit
Excess contributions resulting from a failed ADP test, reclassified as catch-up rather than being distributed
If you adopt an amendment to limit deferrals, then deferrals in excess of the stated limit would automatically be reclassified as catch-up. Assuming, of course, your plan document permits it, which if it a volume submitter document it almost certainly does.