SMIMEA records on CloudFlare can't really be used?

I keep getting “The content length is too large. (Code: 81041)” when trying to make an SMIMEA record. But I can’t make it shorter, as far as I am aware it needs to feature the full certificate.

How am I meant to make the record?

So far the only thing I found regarding this is two posts of someone with the same problem.
https://community.cloudflare.com/t/increase-the-character-limit-for-smimea-dns-records/55080
https://community.cloudflare.com/t/error-when-creating-smimea-record-with-full-cert-code-81041/54422
Answers to these posts are unsatisfying.

“there are no plans to increase the character limit in the near future”
Why have SMIMEA selectable when making a record then? What is the point?

@MoreHelp

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