Drill and mount outdoor umbrella to granite base

I’ve managed to order the wrong base for my outdoor umbrella and am wondering if someone can assist. I’m hoping someone can drill and secure a umbrella mounting plate to a granite base. It’s a 3m x 3m cantilever umbrella and a 25kg granite base. The umbrella uses a 4-bolt mounting plate, but the granite base was originally designed for a centre-pole umbrella. I someone could: - Mark and drill 4 holes into the granite base - Supply or advise on suitable anchors/fasteners - Securely attach the umbrella mounting plate to the base Experience drilling stone/granite is preferred. Photos of the base and mounting plate are attached. Located in Marrickville. Flexible on timing.