using fruity, create a second copy of your kick channel, and place the reverse kick like this:
1. (normal kick pattern) : K---K---K---K---
2. (reversed kick) : ------------r---
(use the 'reverse' option from the sampler channel settings)
you could do stuff like K---K---K---r--- this way before new stuff starts, for example, or use the r alone, to introduce new stuff.