Depending on how low down the bolts are compared to the chassis front rail and wheel arch access space then removing the cam shaft end engine mount and the central gearbox mount and leaving the gearbox end mounts in place one may be able to lower the alternator bolts into an accessible position.
Of course when doing this one may have to unship a front exhaust mount and MUST also check for other items like aircon hoses, coolant hoses, cable harnesses etc. that may prohibit / restrict movement. A two to four inch tilt drop should hopefully be possible if done with care.