I'm trying to picture this exactly--you mean you can't get your butt down low enough, while your heels are on the floor, to grab the bar?
This may be a torso/arms/legs proportion thing, but I can get a bar from the same height I go down to on a squat, but whatever. As I hear you, you can't use the same strategy of putting your heels on a support and pick up the bar.
Since you can't low enough to get the bar, bring the bar up to you. Try doing rack pulls in a squat rack, where you lay the bar's on the lowest pin sets and pull it from there. You will miss the absolute bottom of the lift, but it is better than nothing. You will still, within your personal body functionality, be lifting up something heavy--that's what DL's are a training proxy for.
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