There is one that has helped some..
It's the Kury shift peg cover
4036 // $18.99
Shift Peg Cover (ea)
Fits Honda: '04-'06 Shadow Aero 750
Will also fit most any application with an oval shift peg with a width of 5/8" or slightly larger.
This clam-shells over the shift peg (after removing the existing rubber inset) and makes the shift peg a little "thicker"
Before you buy though you could move the shift lever to the upper position, wrap the shift peg with some thick rubber and secure it in place with plastic wire ties to see if this will indeed help the shift peg position for you.
Patriot Guard Rider
2000 VN750 Sere (Serendipity)
1990 GL1500 (Ole Blue)
1986 VN750 EVie (project bike, heavy custom)
VROC # 11628 / 25000-H
ARVROC # 12 Coordinator and Crowd Control
OKVROC # 18 (H)
TNVROC # 45 (H)