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I'm not a plumber but there's a variety of devices designed to address this problem because... everyone has the same problem. The one under our bathtub is called a plumbdinger.
Well that looks quite useful! Thanks for the suggestion. I'll probably still need to jackhammer away some concrete to fit it, but that's easier than digging down as far as the P trap (assuming there is one, hard to know with this old place) and risk hitting the dunny pipe as well.
I've heard that almost every single bath tub install has this problem.
Like on a new build the plumbers show up before the pad goes down to run the pipework. They measure out where the waste pipe is according to the plan but it might not be perfect to the mm.
Then the pad goes down. Then the carpenters show up and put up the walls. More measuring and inaccuracies and what have you.
The tub is the last to go in, and there's always going to be some variance between that first step and the final step, so there's always going to be something under the tub to connect it to the correct waste water.
We're planning out a renovation to take place in a few weeks. It's above ground floor with unrelated tenants below. Our guys need to drill a new waste water hole through a ~150mm concrete floor. The waste water pipes are in the ceiling of the tenancy below. The tenants are being weird about it... "you can only have access on Fridays!".
That said, our plumbdinger was leaking into their tenancy real bad 2 years ago. We couldn't really get at it without a full reno, which we didn't want to do, so we just put silicone on it as best we could with the nozzle through the grate of the bath tub waste water. That running repair has worked for the last 2 years.