Stick with an ABG type mix, or better yet try an experimental (plant only!) viv with just garden soil, and after you muck it out, you will understand why ABG is worth the money. I do stretch the ABG a bit with home-made compost. Others seem to get away with garden soil that has a lot of choir mixed in, but I haven't tried that myself.
Mosses are hard to grow unless the viv has a fogger and very bright lighting. The snake would probably bulldoze them anyway (mine did). Isopods and springtails should be fine with the BP. (Disclaimer, my planted vivs hold colubrids, I don't even own a BP.) Honestly, maybe you would rather set up a viv for some dartfrogs?
You can buy very realistic false rocks for the basin that are light weight, and less dangerous to the snake (and glass). I can't remember the name of the company (Universal Rock?? something like that) that has the best ones. Look up rock backgrounds for aquariums to find that company. Mag Naturals also makes some realistic fake rocky ledges that go on the glass sides of the viv. These are marketed more for gekos, and may need additional magnets to hold up under the weight of a BP. They do hold my full grown corn just fine.
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