I may have misunderstood, but it seems trans officers will not be asked to conduct strip searches, except possibly of trans suspects of the same sex (a rare situation!). Apart from anything else, the suspect could maintain that they never consented to be searched by the opposite sex, so any evidence collected in the search will be both non-PACE and arguably inadmissible.
The case seems to relate only to the police forcing officers to strip search opposite-sex suspects, as some sort of sop to the trans community. Why do they even need to do this, when PACE rules surely mean that an arrested trans suspect can legally be forced to undergo a same-sex search without their consent? Do they think the suspect will sue, and, if so, what for?
If I was defending a trans person who was charged based on evidence found in one of these 'consensual' searches (also a rare situation, though), I would give the search officer one hell of a cross-examination, to support the idea that they were acting under duress, making the evidence inadmissible.
Plot for the next John Grisham?