In that case this is the best piece of advice I can give you. If you want to beat a grappler, you need to learn to grapple. Simple. BJJers train in a different way, with a different mindset and with different goals to most Aikidoka. The result is in a true application they are likely to have more functional tools availible to them. Or it may be better to say their tools have become more functionalised.
I appriciate your advice Michael however my intention is to hear opinions on how to deal with it from an Aikido perspective I believe Aikido has the tools/techniques to neutralize the whole attack at its begining if applied in good time.