I'm pretty sure you can. It would be best to get the fueling adjusted though. I think the purpose of the race ecu is it gives a greater tuning parameter.
Do yourself a favour and get your existing ECU mapped to suit the Termi. Worth every penny... £425 from CJS Racing near Bristol - best money I've ever spent on my 999. Not very near to you but there are other options like Cornerspeed in Nottingham?
ChrisW is a member on here and he's able to load the DP map (that is supplied with the Termi can) onto a standard ECU which you can just post to him. This is a simple and cost-effective solution for people who've sourced a Termi can but don't have the DP Ecu. That's not the same (obviously) as a re-map with CJS, who will spend a day with your bike on a dyno and create a custom map (for each cylinder) and get it running as good as possible.
Wow it's I suppose all down to cost at the end of the day I've only got 2500 in the bike off a friend that was needing a quick sale I don't want to go big bucks on it as I have other bikes