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Is there a blanket that covers the bellhousing too?
I don't see much difference in cost?
$316 for CF cert for 5-years
$90 for blanket cert for 2-years ($225 for 5 years) + bellhousing/flexplate shield cost?

NO, and that is the reason for a shield. If you have a stock floor and fire wall the CSR type is all that will fit, and fulfill nhra requirement. The "thick aluminum" type wont fit the stock trans tunnel, and then you still need a bellhousing shield. Generally these items are for tube chassis door cars and dragsters.