Dwm: Remapping Shift+Insert to Mod4+p

Question

I'm looking for a way to globally map Shift+Insert to Super_L+p for easier finger access to primary buffer pasting across terminal and gtk apps.
I'm trying to do this with xdotool.
Relevant lines from my config.h:
#define MODKEY Mod4Mask
static const char *pastecmd[] = { "xdotool", "key", "--clearmodifiers", "Shift+Insert", NULL };
{ MODKEY, XK_p, spawn, {.v = pastecmd } },
After compiling and restarting, Mod4+p doesn't work as I'd expect (i.e. nothing happens when super+p is pressed).
Running "xdotool key --clearmodifiers Shift+Insert" from shell and dmenu works (primary buffer is pasted).
Running "sleep 5 && xdotool key --clearmodifiers Shift+Insert" from shell and dmenu, then focussing a text box in a gtk app such as Firefox within 5 seconds also works.
Looking for info on why this isn't working?
Perhaps theres another tool or way of mapping key combos that would do this job. Suggestions?

Answer 1

Doesn't work with xbindkeys.
~/.xbindkeysrc
"xdotool key --delay 0 --clearmodifiers Shift+Insert"
m:0x40 + c:33
Mod4 + p
xev output after the mapping:
KeyPress event, serial 29, synthetic NO, window 0xe00001,
root 0x157, subw 0x0, time 11820231, (486,597), root:(488,613),
state 0x0, keycode 133 (keysym 0xffeb, Super_L), same_screen YES,
XKeysymToKeycode returns keycode: 108
XLookupString gives 0 bytes:
XmbLookupString gives 0 bytes:
XFilterEvent returns: False
FocusOut event, serial 32, synthetic NO, window 0xe00001,
mode NotifyGrab, detail NotifyAncestor
MappingNotify event, serial 32, synthetic NO, window 0x0,
request MappingKeyboard, first_keycode 8, count 248
MappingNotify event, serial 33, synthetic NO, window 0x0,
request MappingKeyboard, first_keycode 8, count 248
FocusIn event, serial 33, synthetic NO, window 0xe00001,
mode NotifyUngrab, detail NotifyAncestor
KeymapNotify event, serial 33, synthetic NO, window 0x0,
keys: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
32 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
KeyRelease event, serial 34, synthetic NO, window 0xe00001,
root 0x157, subw 0x0, time 11821150, (486,597), root:(488,613),
state 0x40, keycode 133 (keysym 0xffeb, Super_L), same_screen YES,
XKeysymToKeycode returns keycode: 108
XLookupString gives 0 bytes:
XFilterEvent returns: False
xbindkeys -k after mapping:
Press combination of keys or/and click under the window.
You can use one of the two lines after "NoCommand"
in $HOME/.xbindkeysrc to bind a key.
"NoCommand"
m:0x40 + c:133
Mod4 + Super_L
(the same xev and xbindkeys -k output occurs when doing the mapping in dwm's config.h)