I am retired from soccer... just running now. I don't know of any soccer shoes now that provide good pronation control, but there are a few things you can consider. One is to get a pair of insoles like superfeet insoles to wear in your boots. I think they make a thin, or low-profile style that fits in cleats. Otherwise, you may need to get your boots a half size larger and then put in a good motion control insole.
The problem with using a replacement insole is that it raises your foot in the boot, especially your heel. This may make you less stable and more likely to roll an ankle.
Something else to consider is wearing turf shoes with replacement insoles instead of regular boots, if not for matches then at least for on-field training and scrimmages.
Of course, a really important thing is to work on strengthening your feet. A good exercise is to pick up a pencil with your toes (not between your toes). Another exercise is to gather up a small towel using your toes. You lay it in the floor in front of you and then grip it by curling your toes under and pull it in towards you. You can do these while sitting around in the evening.