Keep going! And also try the full will transcription sites. Most of my best breakthroughs have been accidental when looking for someone else - that's why I suggested the wives' surnames as well.

I chose the easiest one and had a quick look for Dorothy Wattleworth, and found (Maughold):
1781-1 E d[ecree] CHRISTIAN Dorothy, [als] wattleworth d 16 may 1781; ch wm, john, ellinor + cath; all ua[underage]; husb wm; john + margt wattleworth unc + aunt guardians.
[Manx notebook]

It doesn't help much because her mother died before Elinor was married, so of course didn't name her husband - but you might find later refs in Christian or Wattleworth wills. - Also check who the siblings married and look for them. She and husband might be named as uncle and aunt guardians.

It is a slow process, but a lot faster than looking through endless films before online indexes, summaries, and transcripts.

Good luck!

Sue