Cancelling into Knee/Uppercut

Any advice on cancelling into these 2 specials? I’m a former Ryu/Evil Ryu player, so cancelling into hadoken was super easy (down + press a button, then move the stick to the right and press another.) Sagat, on the other hand, requires a cancel into DP motions. So how do I go from down to a dp motion consistently considering how quick c.lp is?

check this link out…should be helpful.