Hi Goji,
I've had a similar situation, although not quite as big an 'overdose', and I carried on bolus injections as normal then reduced my next basal (but still took it at the same time). That worked for me.
I think in your situation, with the higher extra dose, I'd be tempted to reduce my bolus ones a little too. And just keep testing blood to check, and obviously have stuff ready for hypos at all times.
Just so you don't feel too much of an idiot I'll tell you the worst overdose I did. Once when I was totally sober and non-hypo I injected 18 units of long acting (at the correct time), thought the pen wasn't working for some reason, injected another 18 units, still thought it wasn't working and injected a final 18 before common sense kicked in. :roll:
I went and ate a lot of cake, and still went hypo, and went and ate a lot more cake. Stayed up much of the night to ensure I didn't go into coma. Felt grim all next day. That was in the days of Protophane which I think (may be wrong) was not as long lasting as today's long acting insulins.