Until he's over his jiters (if he ever does get over them) the two of you could try the soft swing kind of thing...just having intercourse in the same room as the other couple...maybe swap for oral/or foreplay but when it comes time for actual penetration, each with their own spouse. This could help him, hopefully, in time become comfortable and at the same time build up some confidence so his jiters subside.
Then again if he's adamant that he doesn't want to swing in any way, shape, or form...it might be wise to back off, not swing and give him some time and space before bringing it up again.
Quin
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