Henrik
Sounds like you are going to try it without the canister, we are all keen to know what happens.
If it has no membrane inside then it is not a conventional damper type accumulator, however it will still alter flow characteristics. Empty canister type accumulators are fitted to tractor hydraulic systems to reduce noise for operator comfort.
There was a cost to fit it as standard, so at that time there was a reason, let’s see if you are correct and that with a modern pump it makes no difference.
Best wishes