The one Cobrinha is using I use all the time for 2- 3 minute rounds (15 second pause after each lap as you will get dizzy) - make sure you are envisioning the opponent passing as you do it and framing the whole time. It is phenomenal at getting you used to Inverted Guard... easy to progress too, just replace the wall with a partner and have them move laterally / in a circle / etc. When you don't have a wall just do the straight legged version from the warmups.
NEVER under estimate the importance of shrimping (PROPERLY! Use Eddie's cues on backing the ass up and out), reverse shrimping, Granbying, fluent technical stand ups, less keen on sprawls - but you should do them until you get the mechanics down, shoots with a lateral step, side control - knee on belly wind shield - knee on belly - side control on a heavy bag, lateral jumps from side control on a heavy bag (one leg scissor and double leg), start kneeling as if in guard - flip the toes - step one leg up and throw weight into that leg - then twist your body as you step up the other leg to mimic the explosive guard stand up, pop ups (same as before but as soon as you flip your toes jump to your feet), stability ball work I'm still on the fence with but I'd say do 10 mins a day for a month and see if it does anything for you.
That's about 30 minutes of solo drills there - just split them into rounds.