As I pretty much stick to working in specific bands (450-470), (928-960), (3.5-3.8) I use HPF/LPF filters in combination. I can benchmark the combined filters in to a BPF with a tracking generator. Normally I just leave the combinations alone and string-tag the assembly so I can pull things off the shelf and have a reproducible result.
I would love to have a super-adjustable BPF but the cost would be almost as much as the BB60C.
Thank goodness I am out of the compliance testing world and just do product evaluations and comparisons.