I get what you are saying but why not use both picks? When you mining high level ores use the elder pick you already have and when mining lower level ores use you augmented dragon pick for invention xp. Not sure if polishing perk still works but it might be good to use it for the lower level ores.
Only you can answer which ores to mine because it depends on what you going to do with them as in use them or sell them, and for now the highest level ones or any of the new ones will be the best ones. No point in mining the old ores the market or your bank is flooded in.
Basic rune will still be in demand later on as its needed to make elder rune. Level 50 ores and level 60 pick should work well.
Golden crabs should still be best xp (only with a high level pick) but no GP value from them so again it depends on what you want.
Although invention is not really directly trained, it is the main purpose of my mining(WC and fishing).
So I expect it will be less important unless Dragon Picks drop in price back towards the cost of a Dragon Hatchet. Or a better augmented pick become readily available in game (that is the one I can play)
If you want to stick to your dragon pick it's best mining orichalcite and drakolith. Maybe you could try the lava flow mine if you have it unlocked. But everything higher than that would gimp down your experience rates too much.Improvements: Tooltip / (F2P) QoL v2 Quick Fixes: Invention