Sorry ... no comment about the foam and the foot pedal. I'm always leary at adapting features, so I'd first ask my dealer as to any suggestions to deal with a challenge that you have told us. They may be able to do an adjustment that could help you. Or have other suggestions.
Perhaps this is the time to consider changing machines?
Most have a speed control that you can set on the machine, to keep it in slow gear, no matter how much you press on the foot pedal.
Plus some have the option to NOT use the foot control, using a start/stop button.
And there may be other features that could make your sewing easier.