A bit late to the conversation, but a fairly inexpensive module to add more low-end would be the tiptop audio fold (https://www.modulargrid.net/e/tiptop-audio-fold-processor). You do need an oscillator to feed it, which might be a downside for you. However you could use any oscillator I believe, especially sine wave are working just fine (I'm mostly using one from Qu-Bit's Tone filter in self-oscillating mode).
Besides a wavefolder, which sounds pretty awesome in low-end in my opinion, you get square wave outputs from the source frequency plus 1, 2 and 3 octave shifts down. You can mix these together however you like.
Also, modulating the "fold" and "inject" with CV has a big impact on subdivided output as well. It makes for a sort of pulse-width modulation effect. Divkid has of course an excellent video on it, highlighting the sub out and its modulation as well:
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Got it.