If you’re doing this then you’re turning more valuable meat into less valuable meat surely? Steaks cut and packed around £20/kg, what do you ask/get for fajita strips?
One sliver of meat from the haunch of a roe about 6-10g max makes it across into the fajita strip pile, the rest is £20-65/kg off the haunch with about 80g of it making the diced steak pile and a fair bit less into the
mince scraps pile (trim of the thick flank base, innermost of silver heel, other scrapings off removed sheath sinew, etc)
Rather upsell than downsell personally, but of course there’s many a way to do it, and not everyone is trying to maximise yield like your livelihood depends on it.