considering how much more sensitive mushrooms are, i trust your oven skills.
however, there is a pretty simple safe way to do this that is totally hands off.
you can always put the filets on the intake portion of a fan, the best modification of this is to a box fan
place the box fan between two objects (ie chair seats) so that the intake is upwards and the exhuast is facing the floor.
lay your filets on the grate covering the turbine. this takes 12 hours or so. the more surface area exposed the quicker it will dry, take your filets and slice them in such a way they are more exposed to air (you can divide them long ways or add slices up and down each side)
note that once they become smaller than the grate they will either stick to the grate or fall into the fan getting semi broken before being ejected onto the floor/ surface underneath.
its no big deal to pick up dehydrated cactus chunks from the floor, its not as bad as youd think considering you just scored dehydrated skins without using a dehydrator.
these chips may not be totally dry, you can then either place them back on the grate ontop/ innovate a finer grate or wide mesh to allow them to dry completely. or leave them in an open container and theyll dry out by themselves a bit slower
achuma puma