I have Shimano M785 hydraulic disc brakes.
It is easy to remove the pads and put them back in again even with the disc in place. However, resetting the brake pistons is tricky. I currently use a butter knife and two hands, which mostly works but is very awkward.
All the directions I've seen for resetting pistons (for example) call for removing the wheel. I'd would like to avoid this step if it's not essential; it transforms pad replacement or access to the pistons from a quick 5-minute job to one that requires a workstand and may be dirty due to chain contact. For example, this is relevant when diagnosing issues that require resetting the pads more than once, or perhaps in a shop where time is money.
Is there a tool or technique that will let me do it easily without removing the wheel?