@0% you most likely will not get any off MSRP. So, is 0% really 0% ?
If they tell you that there is no price difference between full payment or 0% for 60 mo, then I guess your question is moot. So far, that's what I've been told by Deere.
Kubota will take of $1500 for a full payment.
These are my local dealer obviously, may differ elsewhere.
If your going to get a SSQA adapter in the future I say go ahead and let them do it there now and be done with it. A quick search on the internet I found a 66" bolt on tooth bar for $275. Look around before paying them $400 for that.