Is the J41 a common type rating with the J31? If so Blue Islands in Guernsey would be very interested to hear from you.
What I would also say is because you have passed a couple of type ratings and have some time on type you shouldn't have any problem passing an IR initial again with a bit of training. I think if I was in your shoes I would not spend any money on keeping current while on JSA. I would then sit tight and as soon as a job came along (any job) I would start putting money aside so that when the flying market picks up pace I would have money to get all my licences back. Just my two pence worth though and I'm sure you have a million and one other factors going on.