I did combine formula and breast milk although it wasn't planned that way. DD was in NICU for the first 24hrs and we didn't get to try breast feeding in that time. When we did, she didn't take to it at all and after 48hrs of her having had virtually nothing to eat, we gave her some formula in a cup. They wouldn't let us go home unless we had established either bf or ff so we had to give her a bottle. I had a hard time waiting for my milk to come in and was expressing breast milk. We hired a double breast pump from the hospital to help with my milk supply and then once it had come in, I had further problems as I had thrush so it was really painful. It was a good 10 - 11 weeks before all the problems were sorted and I had formula on hand the whole time.
In the first week or two, as the mw and hv had been concerned about the rate she was putting weight on, they recommended us feeding every 3 hours. But she very quickly started going longer at night (about 5 hr stretches) so I just started waiting for her cues (which coincidentally were approx every 3 - 4 hrs during the day) There was no real routine at all until after we started weaning so I just tried to express as often as I could. Whenever my mum and dad or mil came round, I'd leave the baby with them and disappear upstairs to express. I'd always start by offering the breast, then expressed milk and finally formula.
DD never had any issue switching between breast and bottle (and she'd had the bottle from 3 days old). She's now just had her 1st birthday and is still bf at bedtime and has had no issues learning how to use a beaker or cup. Maybe some babies do have problems but they're quick learners so they'll get the hang of it - I really wouldn't worry at all. Even if they do have problems, I had a friend whose baby one day refused the breast completely and she spent 3 months expressing milk and feeding him with the bottle. It hasn't affected him long term though - he's at school now and is doing fine. Everything's just a short lived phase. Each baby's different and you need to just go with the flow.
I would definitely recommend a breast pump if you do decide you want to share feeding times with your husband. Then you can have the best of both worlds.
As for DH bonding, although he was quite enthusiastic at first, he was grateful when ebf was sorted as it got him off the hook with night time feeds
and, as he went back to work when DD was 3 weeks old, it had been tiring for him. (It was tiring for me too but I could grab a nap when DD was sleeping so it wasn't as bad.) There are plenty of ways DH can bond with the baby - mine played guitar at her and she was fascinated from only a few weeks old.
Just a final thing, if you do have any problems whatsoever, seek out your local lactation specialist. I had amazing support through the hospital and local children's centre. I've heard that some NCT and LLL groups can be quite judgemental but I had nothing but help and understanding as these groups were run by NHS so the people involved were just focussed on making sure the babies were happy and healthy with no other agenda. At the end of the day, there's no point being precious about breast feeding if it means your baby is not getting food inside them. Breast is best, but that doesn't mean formula is bad. It's second best - and that's fine.