That type of plastic should be fine for the solvent, I'm not sure what lye will do to it though.
But seriously dude, if you are going to extract something as special as spice try to get some proper equipment.
There are many inexpensive clear glass containers at Walmart or other places.
When you go about something in a cheap and lazy way, the results will reflect your effort.
And the entities will bite you with their sharp teeth!
Give the spice a little smile... and cross the veil in style.