This is fine and a good idea, but did you need aikido for this?
I'm a very different person now than I was 20 or 30 years ago.
I feel I've grown a lot. I attribute much of the change to Aikido.
Maybe it would have happened anyway of course.
Anyway - this is how I deal with people now and it works for me.
If someone is expecting an answer of technique X to deal with BJJ then it a bit of a daft question. If it was what principle then my answer would be irimi / atemi.
My bottom line would be fight like a dog. I'm not looking for a fight but if someone wants to beat me then they will have to do just that.
ps If any BJJers see this as a challenge then we are on but you have to be as old and knackered as I am.
pps. I think I'm the same age as Randy Couture! so best leave MMAers out.