You can upload the MicroBlocks ubp file in this topic.
I made also a number of samples with Snap! and MicroBlocks together. Let's see if I find a little time to upload them.
FYI: In the latest dev version of Snap!, Snap! Build Your Own Blocks, you can try the latest version of the MicroBlocks library. You have only 3 blocks and can use the standard Snap! broadcast block to send messages to the microcontroller.
This is a link to my Google Drive with 4 very basic examples that I made and used in Walldorf during Snap!Shot.
It was made for micro:bit's or Calliope mini 3 boards that have a lot of sensors. The activity was for children from SAP employees. I had a 2 hour workshop and the children were able to use 2 programming languages at the same time and often for the first time.