This is know as a "discontinued approach". Firstly, THERE IS NO HURRY. You need to think about what you need to achieve and how you're going to achieve it. Selecting TOGA would not be a good idea..... with flap selected you will engage SRS GA TRK with all the associated excitement and in the example you state the missed approach altitude is below so the last thing you want is climb command. Just maintaining current altitude is also not a good idea as you potentially risk compromising separation with departing traffic - think of a multi-runway airport like AMS.
Here's how we do it.....
To discontinue the approach, proceed as follows:
PUSH V/S - this levels the aircraft.
SELECT GREEN DOT SPEED - wind the bug into the barbers pole.
IF G/S IS ARMED PUSH APPR PB (LOC and G/S modes are disengaged)
PNF SELECTS FLAP IN ONE STAGE IF REQUIRED AND REQUESTED BY PF
RETRACT LANDING GEAR IF APPLICABLE
PF USES V/S TO ACHIEVE THE DESIRED ALTITUDE
FLAP RETRACTION ON SCHEDULE (At no time are the thrust levers moved to the TOGA detent)
Note:
As the thrust levers are not set briefly to TOGA detent, flying over, or close to the airport (less than 7 NM) may sequence the Destination waypoint in the FPLN.
In this case select a suitable DIR TO waypoint and reprogram the FMGS.
Where specific speed restrictions exist the configuration and use of selected speed may need to be varied.
A few points to note here. When selecting GN DOT you must wind the bug into the barbers pole on the PFD. i.e. if you're at CONFIG 2 with the pole at 200 knots and you're doing 160 knots selected, you must wind the bug to, say, 215 knots - this is to prevent A/THR reducing thrust if you only selected 195 knots. The idea is to keep the power on and clean up on schedule. The use of V/S to then achieve the desired altitude can take a little while to establish as the centre of lift changes as the flaps retract i.e V/S -300 fpm does nothing UNTIL the wing is clean.
The FLT PLN will dump as you cross the threshold. If you've made a copy in the secondary (always a good idea once you start vectoring), just activate the secondary and you can then tidy it up (perf should be there) and have another go.
Don't rush it, think, monitor.
A4