Assuming that your sperm are normally healthy and in sufficient numbers, any way they find their way to the cervix is fine. Manual stimulation will not harm them.
This sounds like an innovative idea considering your situation and should give you some success. Your partner might want to give you a daily hand job for a few days so that you both can see that everything is working properly by viewing the ejaculations and noting that they are strong enough. Of course, you will want to enter into normal kissing and other foreplay before doing your plan and making sure your partner is properly lubricated.
Hi,
I am also in a similar problem.
Its been like this for a couple of months now.
Ur idea seems to be worth trying.