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I am all three guys, my expertise in disguise has fooled you again!
Your combi boiler heats water at a certain rate, that's a function of the physics of it's internal heating matrix. Pumping water out or into it faster won't change the number of degrees it can raise water temperature in a given time frame.
However, it may be heating water to a much higher temperature than you want to shower in so you mix it with cold water. If you can get your boiler to output a lower but shower worthy temperature at a high enough flow rate then problem solved no need to add cold water. Have a look on your boiler, is there a thermostat or setting for hot water temperature. The only problem is you want to wash your dishes at 65 degrees and shower around 32.
You can't get a pump to suck water out of either the boiler or the mains (thinking about this is I'm not 100% sure you can't suck water out of the mains) , if you had a tank and the issue was the height of the tank above the shower being too little then a pump would help.
I would need to know more about your setup, is your water mains fed is that where the low pressure problem is, how is the combi setup. It's possible your combi is just too weak to pump water up to the shower in which case a pump would help but you'd still have the issue of the pump sucking the water through the combi.
I've seen weak shower problems solved with new combi's that's why I asked how old it was.
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Airhead
I've been looking at tapwell.se too but their site is awful so losing the will.
Just had a third guy round, big turkish guy, seemed a decent chap but told me you can't fit pumps to combo boilers so now I'm pretty confused.
Salamander claim their pumps increase pressure from the mains overall with combo boilers.
First guy told me I only needed a pump in the bathroom.
Second guy had to consult his plumber (I think he was just the front man)
Third guy claims not possible (but suggested a good few things for cheap that others claimed were expensive).
@Airhead who's correct? I only trust you!