I would feel very about this. I don't know what your ds's health issues are, but TBH lots of boys in Y2 have difficulty concentrating.
Hoemwork in Y2 should not be something that you need to sit and work at for long periods. My dc got/get some spellings, reading, and one or at most two short worksheets per week. I would never bribe them to do it. I try to encourage them to do their homework for the sense of achievement, the reward of moving on to a new list, the freedom of not having it hanging over them when they want to play, etc.
Things that have helped us:
Change the focus. My favourite is in spellings. Instead of sitting at a table with pencil and paper and plodding through the list, we might do it out-of-doors, in pavement chalks on the patio floor. Or three words at a time in chalk on the blackboard.
REading the schoolbook can be part of the bedtime routine, or a cuddle on the sofa - it doesn't need to be 'formal'. It can ivnolve talking about what you have read or what you think is going to happen.
Written work can be done standing at the kitchen table, rather than trying and failing to sit still in a chair. It can be done with a biscuit and drink, break for a snack in the middle if needed. I have many times sent my ds to run a circuit round the ddownstairs to get rid of the wriggles before sitting down again to complete the task.
I think it is important to go through the work very briefly afterwards, with the child, praising their efforts, and praising their concentration.
The nearest thing we get to a bribe for homework, here, is to tell ds1 (y4) that he can only play Wii or similar after he has done 30mins of any of his homework.