I’d echo the posts above about not mixing speaker sizes, it can work but can also be hit & miss. I’d look for a 2.5XL (210) cab, yes this will get the same amount of power as the 410 but as long as you don’t push the lows you should be fine. Additionally as it’s more than likely that this cab would be on top you’d be able to hear it if it struggles - not so easy with a 115 at the bottom. The added bonus is that this cab in theory should be similar sounding to the 4.5, so for rehearsals and smaller gigs just take the 4.5, for the bigger stuff take both. This is what I do, though with Ashdown cabs not Hartke.