If you have the right credentials, IME can help you with the det cord and some of the other pieces. I purchased 800' ea of 25gr and 50gr earlier this year, it came from a Canadian manufacturer someplace out west. Keep in mind that it is made on the same production line and will be contaminated. Not hazardous, but will set off several detection systems.
For time fuse I sometimes use actual fuse, but first burn it underwater. Functioning underwater leaves it in near mint appearance, but leaves it brittle. Great for display but does not take handling well. If you need high accuracy for training it is better than any inert product.