No.
The plate choke has a thin spacer between the butt-stacked E and I laminations; the spacing is a critical parameter. The channel frame holds it all together. Vacuum impregnated goop also holds things together, but that includes the channel frame - anything strong enough to get it off will likely damage the spacer as well.
IMHO the best way to improve appearance is to put them in a perforated or woven metal can. Sometimes you find them as desktop pencil holders - keep an eye out. The plate choke dissipates some heat, so a sealed or encapsulated can is risky.