I was wondering whether there was any program already made for converting systemd service files to their 66 equivalent. I was thinking of making one for some personal use, but thought I'd just check to see whether it'd be wasted effort.

If not, I'd definitely be happy to upload the source somewhere when completed, if anyone were interested in it.
It will be really difficult because a lot of features are not implemented on the same way (or not implemented at all). For example LimitCPU= can be replaced by s6-softlimit at the @ execute field. ProtectSystem= will be implemented by 66-ns at the @ execute field. And so on. But a rosetta sheet like this one https://wiki.archlinux.org/index.php/Pacman/Rosetta can be really useful

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