Plumbing suggestions...

[Dom]

Drill the tank. It is not hard.
I did the DIY king overflow and added aqua lifter, and various float switches to my apex to prevent overflow a few years back when I set up my tank. Aqua lifter failed 2 - 3 times over the past 2-3 years (algae or detritus inside, or simply dead), then the float switches gave false alarms (connections getting corroded, snail on the float etc.). Every time alarm went off, I have to troubleshoot because it is just not "KISS".
Drill the tank and "KISS".

I don't want to drill the tank. My objection isn't due to the difficulty level, I've drilled several tanks. I have other, more permanent plans for this tank down the road and will wait until then to drill it.