the 7/8 wide will fit the jig well. the length should not be a problem at all. you will probably have to remove the leather wheel tho, and that's no problem. Nice work for GrandDaughter.
Thanks, Grizz. I have not made the time to check into that yet. I opened the planer up and looked at how much blade is exposed beyond its backing plate to see how much blade stock might be taken off. I believe there is plenty, especially given the geometry of the blade and the amount exposed.
First photo is of one of the spare blades. There are two bevels. Darkest area is the back of the blade. Middle blueish area is the primary bevel. Thin shiny strip is the secondary, cutting bevel. Total width is about 0.090" and the secondary bevel is about 0.030" wide. In sharpening, only a small amount would need to come off the secondary bevel. The primary bevel would not need to be touched.

Second photo is of the blade installed, showing how much the blade sticks out from the backing support plate. Shiny area is both the primary and secondary bevels. The think, faint, sky blue ribbon along the top of the shiny area is the secondary bevel. Without having to touch the primary bevel and taking very little off the secondary bevel, I think the blade can easily take a couple of sharpenings, as long as there are no major nicks, etc.

What is not known is how much the cutting edges are exposed on the cutting side and how removing any material affects the depth of cut. I have a sense there is not adjustment for the cutter head on to which the blades mount, so a potential limiting factor will be how much can be removed from the blades and have them still cut effectively. I suspect not much.
This discussion may be about exhausted, but I think it should be continued in the Planer Blade Sharpening Forum, so please take it up there if there is anything more to discuss.
Rick