Personally I hold the mouse by the back scruff so the head is facing him and not dangling downwards. I also blow dry the head a little bit longer than the rest of the body. I found this to be really helpful for him to take it down head first. If you don't want him ingesting any substrate, you can put a paper towel down the area in the enclosure you plan to feed on.
I can't really help with the switching department since mine has always been on f/t. Goodluck!