I'd love to participate in the countdown event, but without putting a diaper on.
I'd love to go to the countdown event but hate to go, putting a diaper on.
I want to go to the countdown event unless I put a diaper on.
I'd love to participate in the countdown event, but without putting a diaper on.
オムツを履かないなら参加したいなあ、
I'd (I would) love とちょっと控えめな表現を使って、そのあとに、without ~と、~が無いならと表現しています。
I'd love to go to the countdown event but hate to go, putting a diaper on.
これは履いていきたくないと直接表現しています。
I want to go to the countdown event unless I put a diaper on.
接続詞unlessを使って~しないなら、~しない限りは、と使っています。
I'd like to take part in a New Year's countdown, but I don't think I'd ever want to wear a diaper to do it.
As much as I'd like to participate in a New Year's countdown, I don't think I'd be willing to put on a diaper to do this.
ーI'd like to take part in a New Year's countdown, but I don't think I'd ever want to wear a diaper to do it.
「新年のカウントダウンに参加したいけど、オムツを履いてやりたいとは思わない。」
take part in で「〜に参加する」
wear a diaper で「オムツを履く」
ーAs much as I'd like to participate in a New Year's countdown, I don't think I'd be willing to put on a diaper to do this.
「新年のカウントダウンに参加したいが、参加するのにオムツを履く気はない。」
as much as で「〜ではあるが」
participate in で「〜に参加する」
be willing to で「〜する気がある」
put on a diaper で「オムツを履く」
ご参考まで!