buttline, I think the answer is fairly straightforward.
If this is a procedure set out in your company's SOP's which all have been trained for, then fine.
However, if it's not, then it's a deviation from SOP's with all the problems that will ensue if something goes wrong.
Seat1APlease, it's all very well saying the nose up trim can be easily dealt with until someone doesn't deal with it and it causes a problem, if it's not a company SOP. Long landing, short wet runway for example?
If you are trained to do a manual go-around from a Cat 1 approach, and it's in the SOP's, then that's what should be done.
The other point about leaving the A/P engaged below DA is irrelevant to the question (with all due respect), as you can do this with only one A/P engaged anyway.
SOP's are SOP's.
