IC - don't worry about it! The FCTM has manoeuvre speeds for F25 and it has been in the 'standard' approach sequence for much of my 737 life until the last few years when 15-30/40 started appearing. As long as both pilots know what is happening..........? I would not be surprised if buried somewhere in the Boeing vaults are take-off figures for F25.
When I started flying the jet, some of the 727 dinosaurs who had been 'forced over' to 'the slug' were (non-SOP) sequencing through F2 on the approach!