I feel guilty for not mentioning Dr Stirrup. Yes, I can rope cock my M380 and BD400 w/o much strain due, in large, to the Dr Stirrup stirrup and rope cocker. Both feet, improved geometry, full hand rope handles together make each xbow feel like the next lower poundage xbow. And the M405 is rope cockable enough that I just take a rope cocker (Dr Stirrup of course) hunting but C-2 at the bench.
In summary, the Dr Stirrup kit seems to reduce the cocking effort to the next lower speed bow.
Surely, Gaston hasn't been thinking of a stock mounted cocking device!!