Restrictions with traditional breaker bars is that you get only 4 ways to orient the bar and typically none of them work best in tight spaces as wrenches/ratchets have multiple positions of locking, but lack the torque handling. Using a 1/2" drive ratchet could help, esp hitting it with a rubber mallet.
After you go through this exercise, invest in a valve (fumoto, Valvomax, etc etc) to replace the OEM bolt and never have to worry about people over torquing the bolt.
FYI, Even the oil filter is torqued excessively off the assembly line. My G1 was like that and so was my G5 Odyssey from two years ago. So doing oil changes at home has fixed all the issues.