Trying to cut corners on securing basically the wealth you are trying so hard to increase is just, well, a stupid choice, no offense! Using the cheapest paper, probably writing it down with the cheapest pen and you might end up in two years with something unreadable. I have a contract from 2018 that because was printed on some really bad paper is now just one gray paper, nothing readable, and lamitating that paper won't do much good either.
I have used cheap pen for backup and I the ones I used more than 25 years ago are still clearly seen on a paper. The only paper that I know that is not good has been the thermal paper.If you get a pen that students are using with the blue ink or black ink, you can use it to backup your seed phrase on a student book paper and it will not fade. If you do not want to use a pen, you can use a pencil. Both backup can last for many decades.
You can do another backup every year.
