I would ride it. I don't think it'll let you down.
And re: frame blocks, I would try something else first. It's the seat tube, so you have access to one end!
Take out the seatpost, turn a close-fitting metal plug on a lathe with a taper on one end (or use a pillar-type seatpost, minus the "seat guts" clamp, turned upside down) and some threads tapped into it so you can screw it onto the end of a long threaded rod. Shove it down there with plenty of grease. Might need an arbor press. Might get away with a hammer. You'll push out the dent from the inside.
Less likely to harm the paint than frame blocks.
EDIT: Just thinking on this more, you may get away with just a hardwood dowel!
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Owner & co-founder, Cycles René Hubris. Unfortunately attaching questionable braze-ons to perfectly good frames since about 2015. With style.
Last edited by scarlson; 09-20-20 at 10:31 PM.