Modern SAMs are going to make it hell for the BUFFs.
AGM-86B/C/Ds and the AGM-158 JASSM have a stand-off range of 1,000 to 1500 NM.
Methods and delivery tactics are classified, but I assure you the B-52 will never reach the radar net much less the operational envelope of a SAM
If you are going to use stand off weapons then there’s no need for aerial dinosaurs at all. Waste of money.