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gbj_tester
JurekB
If you are drilling stainless, you'll be needing cobalt bits.
They're generally spendy.
Axminster Tools may be your best bet for individual bits - as opposed to sets.
Were it me, I'd go for the 5.5Ø and see if I can pick out the remains - as opposed to cutting into the aluminium.
https://www.axminstertools.com/axminster-cobalt-hss-drill-bit-5-5mm-400166?glCountry=GB&gclid=EAIaIQobChMIutrn65bI6wIVUed3Ch0X9wrkEAQYBCABEgLN2_D_BwE