Fuel transfer pump failure worst case scenario would be you can't get the last 60kg if you go faster than 80kts with the forward pump failed but if you slow down to below 80kts then it's only 4kg. If the rearward one fails and you go faster than 80kts minimum unusable fuel will be 7.5kg.
I hope that helps.
If it was me flying private and I know the machine I would be happy to go without floats.
I personally think woodland would be more dangerous compared to water, and they don't do floats for woods.