It's possible, as Christian can attest, but in most cases I don't think it is necessary because of the already extremely long toe to the response curve. That makes it difficult to actually blow out the highlights unless you have really missed the DR in the negative.

Using no restrainer in pt/pd is often essentially the same thing, because unless you have absolutely new FO, you will get a little fog that will extend the toe curve even further.

I see flashing as a procedure that helps extend the toe on papers or films that have a fairly short toe. That is certainly not the case with pt/pd, so I don't think the procedure is as useful as it is with silver printing. However, it is a tool in the bag of tricks, so on a problem negative it may be an approach that could produce a superior result.