Do yourself the worlds biggest favour and learn tumbling in a gymnastics environment! I quit gymnastics when I was 13, I had no more than a double back handspring, and level 1 (cheer) skills. Over 5 years in all-star cheer (I'm now turning 19) I am defiantly a better tumbler than when i started.. and I've been told many times by team mates in particular that I have 'pretty non-cheer' tumbling, and I credit that to my gymnastics background- HOWEVER when I go to the gymnastics club the CRINGE at my technique. I have a weak set, and weak blocking technique, and I don't have the core strength to twist 'properly'. I wish I had continued in a gymnastics coaching style (for tumbling) for my 5 years of cheer because I know I would've been getting conditioned properly, and learning the proper progressions.
As for progressions - I have a fairly comfortably full twist into a pit, and so the gymnastics coach said for me to start working 1 and a half twists. I asked how I was to do that, and he had to RE-teach me how to do just a simple 1/2 in order to properly progress to a 1 and a half. Then i asked why I don't just start 'chucking doubles' because I will never use a 1 and a half, and he couldn't believe that half twists are unheard of in cheer.
IMO It is a completely different way of learning tumbling (gymnastics vs cheer) and I believe that although the progressions and conditioning may seem useless and slow paced at the time- once you start learning elite skills (twisting skills, connection skills), they will come a lot quicker- and it will save your team mates and coaches from a heart attack when they watch a janky full or double twist.
ETA: Granted cheerleaders cannot compete a full in back out - but HOW do you think the olympic gymnasts learn skills like this? - how do you think they get to that high of a level of skill? It is because the style of coaching, and the progressions offered in gymnastics, I can guarantee when a gymnast first throws one of those skills- they know EXACTLY what they are doing!! Why? because the progressions have given them the spacial awareness, technique and strength needed to safely land. I know a USAG coach would NEVER say 'oh just chuck it....'.