Don't worry about the flare pack spontaneously combusting it's a lot smaller risk than not having them and drowning.!
I used to go out on my boat all the time alone, in fact it was the reason I bought it, but Ribbing is a rather social activity as I found out.
It's my belief that you should carry appropriate safety equipment for the voyage in hand and the risks you have assessed, eg if you are worried about getting knocked out then you'd better be wearing a helmet (or if you've accepted a lift from a certain ETec owner). Also have a strategy for recovering yourself if things do go wrong and you leave the boat.
Which will obviously stop when you leave cos the Kill cord will activate !
From what I recall from your Posts you seem a fairly enthusiastic and sensible water rat so have you had any safety training! DO the CG do any over there. There are a few leaflets and stuff published by our coastguard and RNLI and a good book by the RYA if you'd like copies PM me and I'll send them to you, you might have to push me as I am administratively challenged!
On other thing is whem you are on your own you should maybe drop the acceptable boating conditions down a notch in case you do crap out!!