CC2540 OAD: size of minimal A-image ?

I've read the OAD guide and believe I understand the memory map and mechanism.

I'd like an asymmetric A/B setup (minimal A image just for loading, large B image for the 'real' application), and I think I understand how to tweak the projects to do that.

But:

When stripping the SimpleBlePeripheral project (imgA configuration) of everything I can think of, leaving just the stack and the OAD service, the map file still reports a whopping 102kb of code. Not good, my application is around 170k (and 102 + 170 > 256).

Anyone with experience on what size to expect of the simplest possible 'image-A', I.e. just the stack and the OAD service ?

BR

Per