I've said this before ad nauseum on other threads but guess you have not tracked them down.
1. Why is it so important to find an "aiki" solution to a problem Aikido was never designed to solve?
2. How do you define an Aikido solution? Does it need to be kote gaeshi and shiho nage or will it do to take the principals and strategies of Aikido and adapt them to the ground situation? I mean principals like blending, centering, leading, off balancing, focusing the unified power of your movement against their weakest points etc ertc.
3. If you are happy to use aikido strategies on the ground and call that an aikido solution - the good news is there is much that can be done. In fact a lot of work has been done in this area and it goes by the name of BJJ.
I have benefited a lot from your threads thanks Michael, it seems the majority opinion is on complementing Aikido with BJJ, thefore the question now is: would you train in both martial arts right away or concentrate your effort into one until reaching black belt then explore the second?