I am not suggesting anything here so all of you safety fanboys can stay off my rear please.
I have seen 5413 flash with the addition of sulfur screen mixed on national TV for commercial manufacture with no problems and I have seen Mg and Chlorate flash 3" salutes that made it to 400' without flower potting.
I personally am cautious about all flash, it makes no difference to me what materials are used, it will leave you with a stump if it goes off. I try really hard to binary mix when ever I can. At PGI, you have to mix that way, on club shoots I mix that way, for cap plugs and inserts, I make no more then the contents of one shell per mixing and burn the rest (never in a pile) at the end of the day.
Diaper mixing is probably the safest method if using paper only, no butchers paper. If it goes off, you will have a bunch of problems but you should still have your hands. If you put a face shield on, you will still have your face and skin and if you wear shades, you may still have corneas.
I have to look but I think I have maybe 10 types of finely divided aluminum and all are useful but the 5413 H Super is my favorite for reports hands down.
With all of that said, you will get very nice reports with BP and Ti in a tightly confined package and you could drive across it all day and it wont go off, so if you are nervous, try some metals in you BP and spike it with layers of hemp or filament tape.
Danny posted a video of his BP and 5413 mix here. BTW, these are little tiny 1 gram inserts, I sold him the fuse and the cap plugs.