Yeah getting the bumper sprayed won't show badly against the wings at all,any 1/2 tidy shop can do that.
If you can get the bumper off it could be painted off the car,trouble is then as the paints soft you need to be really careful moving it about.
The quarter will need paint but a really good wet flat with 1500 and g3 would significantly improve it but it's deep so it will always show.
I'd say £1-150 for the bumper if off the car,another £50 or so to strip or mask it and about £150 as a base price for the 1/4.
Most bodyshops should offer a little deal for the two,say £300 for the lot inc materials.