A possible BioB bipass route

Nearly a decade ago there was something bugging me and I believe I have figured it out —although it's pointless now. Namely, is another way of making biotin possible without using BioB, biotin synthase, an incredibly slow multistep radical SAM enzyme. 

What-if: Biosynthesis of deazaguanine

7-deazaguanine is an analogue of guanine that has a carbon instead of a nitrogen. This molecule that is not made in nature, but many substituted versions, namely queine, archaeosine nucleobase and their precursors. These are made via a different route. However, it would be very feasible to make via straightforward enzymology.