I am looking to purchase a long metal thumptip, ideally similar to the Goblin Thumptips previously sold by Morrissey Magic, but something similar would do - I have only found short metal thumptips for sale but want a longer (almost) full thump length version. Thank you in advance for any suggestions/links.

Not knowing your application, but maybe a Vernet-type sixth finger with a metal(short) tt added to the open end would work...?

I see the Morrissey goblin tips pop up now and then on eBay.

Recently, I purchased two metal tips from MagicGoods.com https://magicgoods.com/products/thumb-tip-copper

They are not quite as large as the goblin tip, but are fairly large. This might be suitable for what you’re wanting to use it for. (?)