In this Make Pullups 10x Easier video I talk about the importance of opening up the shoulder joint to more advantageously perform pullups. This same issue is what can make the bottom position of Lever Pulls so challenging. That initial engagement of the lats and scapula required to perform a lever pull and any level is quite challenging--and at first often impossible.
Now I don't like to use bands for pullups generally because they help you the least when you need it most (at the top). Though in this situation guys and girls are a bit different. I have found that men are generally stronger on the bottom half of a pullup and girls are stronger on the top half. This is largely due to the overall structure and flexibility differences between men and women.
So with the front lever pull, this initial upward movement is really hard--especially when you bring the knees up first, which prevents that backward lean shown in the video above to make pullups easier.
In this instance, the band is perfect for helping to overcome that initial hump for front lever pulls all illustrated below.
Remember it is important to do a combination of static holds and dynamic movements even when pursuing a static hold like the front lever. Be dynamic.
Use the band to help you hit some nice sets of 3,5, or even up to 8 to really groove that shoulder position and movement down.
Better every day,