Intestacy with BPR Assets - DOV Consideration risk?

I am speaking with a family where H died suddenly Intestate. Large estate, taxable, as a result of the Intestacy rules.

My reading is that as the BPR qualifying assets weren’t left specifically, the relief would be spread across the whole estate, so some of it overlapping with the half of the estate passing to the Spouse, thereby being wasted.

That being the case, Can W prepare a DOV passing “BPR Qualifying assets” to a Discretionary Trust with her children and herself as potential beneficiaries? No issue with it being settlor interested for IHT due to the DOV. But, does the fact that she is a potential beneficiary cause any issues with ‘consideration’?

Seems fairly uncontroversial planning or am I mistaken?