I have a hard time believing that a thicker oil will help a starved valvetrain. The ticking is either due to slop from worn pushrods or rocker arms or it is due to clogged lifters not getting oil. Thicker oil shouldn't help in either case. If it's worn parts, the lifters are extending as far as they can and not making contact, when slop is taken up, you get a tick. If it's clogged lifters, thicker oil will just have a harder time getting in, making the ticking worse and possibly accelerating wear.
Thicker oil is always a mask and can often cause issues elsewhere. About the only circumstance it's good in is sloppy connecting rod bearings where the thicker oil flows slower and thus helps build pressure so that other parts receive proper oiling. People also use it to quiet down an engine that's knocking or one that has shot piston rings and is burning oil like crazy. It may work in those circumstances but it's not helping your engine at all. Thicker oil may cause more cold starvation as the pump tries to build pressure but relieves itself at 60 PSI, it may take a long time for the oil to get up to the cam and lifters. This may mean accelerated wear.
For what it's worth, my engine ticks when cold and quiets almost completely when warm. I replaced the pushrods & rocker arms. Made no difference. It's almost certainly clogged lifters. No way I'm going to invest in head gaskets, machining heads (maybe even new heads), new head bolts, new lifters, hassle with exhaust manifolds, intake gaskets and more just to get rid of a tick that doesn't affect engine performance. Maybe if I blow a head gasket but even then, I'd have to question it on a 231,000 mile engine.
My recommendation from the research and personal experience I have; either live with it or pull a valve cover and inspect the rocker arms & pushrods. If you see massive amounts of wear on those parts and you have some money burning a hole in your pocket, maybe tackle that. If they look fine and you feel like taking a gamble, grab a mechanic in a bottle like Seafoam and try it in the engine oil to see if it cleans the lifters. Probably won't work but if you're desperate, it's a cheap gamble. Don't get too aggressive down that route, you may wind up with oil leaks that will aggravate you more than the tick.