Bristow has an FFS B /FTD 3. If you this level is inadequate and would hold out for a level D, you would be foolish. There is virtually no practical or useful difference between these two grades. Sorry if I am pre-empting your response incorrectly!
Pretty sure AH's ABZ sim is similarly qualified (ie FFSB/FTD3) but I'm sure DB will correct me if that is wrong. I'm fairly sure the only level D is at Helisim. Personally I would rather use the Aberdeen devices even discounting the issues with travel, availability and cost.