I have never used it for anything on pens, but the brand I am aware of, Tree Frog Oily Super Glue, was something that was a medium to thick bodied Ethyl Cyanoacrylate variant. I think it might have also included some additives to help raise the typical temperature spec towards the higher end.
Typical Ethyl Cyanoacrylates have heat ratings somewhere from 80C to 120C (180F to 250F) depending on the chemical additives. They are almost always rated based on the point where they lose 50% of their strength. The temperature related additives are designed to provide a secondary curing that provides additional cross linking of the polymer. I don't know the specific physics behind it nor how long it takes for the secondary curing to occur. Standard CA glues retain 80% of their strength all the way up to 50C (120F) and then degrade rather steeply to 50% at 80C (180F).
Let us know what you think after you give it a try.
Regards,
Dave