Please do not attach youself to the boat! If you forget to attach the kill cord and fall out when underway then you are likely to be dragged along and drowned.
Even if the kill cord works your swimming style in surf would be seriously restricted by 10m of polyprop rope wrapped around your body.
I agree with Roy, the sea anchor idea works well. It is wind that carries the SIB away from you (you drift at the same speed as the boat with the tide) and a sea anchor slows the wind driven drift.
I use my SIB in the surf quite a lot and have been bounced out once and capsised twice. On all occasions I have found a sea anchor to be of massive benefit.
I have the sea anchor attached to a short line that runs from the bow eye, along the deck, back to me. The anchor is wrapped in a velcro strap. The velcro strap is then tied to my bouyancy aid.
If/when you stuff the boat and get thrown out, the velcro releases the anchor and massively slows the boats drift.
I keep the line delibrately short (12ft in a 14ft boat), so that there is no chance of the anchor deploying under the boat and snagging the prop. This reduces the holding of the anchor (it can snatch out of the water), but is sufficient to slow wind driven drift and keeps the SIB head to sea in surf upto about 1.5m.
Use of lifeline to stay with boat, get back onboard
Once you get back to the boat, you need one of these http://shop.lifejackets.co.uk/acatal...Lifelines.html
to make sure you stay with the boat. You may be tired, and unable to get back onboard and a lifeline will keep you with the boat and make search and rescue much easier.
You can then use the life line to make a strop to help get back onboard. Clip each end of the lifejacket lifeline to the boats life line. It helps if you connect either side of two gluing points. The lifejacket lifeline will hang down in a loop and you can use it as a step. (similar to MeMe's http://www.rib.net/forum/showthread....der#post134776
- but a lot easier to get your foot into.)
Will take some photos this afternoon.
Hope this helps