Some of us have miter trimmer knives and sharpening the knives accurately can be a chore...
I saw this iron sharpening jig elsewhere..
add drawer casters to it and adapt to hold the trimmer blades/irons and I believe you have solved an issue..
to add the caster..
''wheel well'' for the caster wheels w/o the bracket and drift pin the wheels into place...
twin keyhole/T slot the jig's face to make for adjustablity...