The first legering bite indicator I had - rod top aside - in around 1971 was a "butt indicator". A short aluminium rod about 2mm thick, attached to the rod butt with a Terry clip and with a necklace-type sprung ring to let you put the line through it without setting up again. It had a hinge that let it move through about 60 degrees. Other versions used rubber tube instead of the hinge. They were better than the rod top, but easily beaten by any flow. Go to method for bream on canal wides or far bank round our way.
But there's a better answer that works well when the problem is fast roach bites/bait dropped before you can strike. Springtips aren't as versatile as quivers, with limits on the distance, tow and flow they can cope with, but if you're fishing inside 30 yards on stills or, for whatever reasons, fishing light leger at pole distances of 10 -14 m, they can double the number of bites hit. I have springtips I've made for all my wand-type rods, and I find them great for winter roach fishing amongst other things, though I'm not selective about the size of roach.
The idea is that unlike a quiver where the resistance to the biting fish increases as it bends due to its taper, the spring tip, once it begins to move, fold over easily and delays the moment when the fish feels the rod tip and spits the bait. That little bit of extra time makes all the difference. It's quite an eye-opener. There were some made commercially, but were generally a bit clunky with unnecessarily stiff springs. TriCast, with some North West expert match anglers' input, made a dedicated springtip rod with a range of tips in the late 90's. You can make them yourself and use a push-over fitting, made from a bit of discarded pole tip. Big TS's will have plenty of unwanted pole number 1 sections. Hours of fun for the inventor and experimenter.