Need mechanism or tool that helps in cleaning (accessing) gate pocket from Fe debris;
A gatevalve allowing Fe-debris to be catched in pockets under normal conditions indicates not the best valve construction suitable or selected under the present conditions.
Cleaning might be difficult, and best solution could (as you suggest as alternative) be to change the conditions/ equipment.
A butterfly  valve with the shaft horizontal is less likely to be affected by accumulating debris than a gate valve.  Just be sure the seat pocket in the butterfly valve does not contain cavities in which the seat flexes.  Otherwise, the debris can collect within the seat cavity, preventing the seat from flexing and preventing the valve from closing.  Some triple offset butterfly valves with the flexible element on the disc may be a good choice depending upon the process requirements.  As always, you don't get something for nothing.  Every type of valve has its strengths and weaknesses.  Just be sure you are not solving one problem but creating another.  You must best match the process conditions to the valve performance expectations.

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