Looking For A Best Suggested Approach To Apply Hold On Sales Order Header

Summary: We have a requirement like below.

1. Order#order1 with two lines is created and submitted for fulfillment.
2. Now user wants to update the quantity on one of the line, so we will create a revision order for the same and updated the qty.
3. We need to apply hold(at header Level) when there is a change in order details.
4. Tried to utilize Groovy Script (OM Extension) on start of submission request. But came to know like we can't apply hold using groovy on sales order revision.
5. One more way we tried like, using Groovy script we will update EFF flag as Yes at order header level and tried to create a scheduled to integration to apply the hold depends on EFF flag. But in this case there is a delay(depends on the integration schedule details 15 min/30min) in applying hold.