If your party is in love with in-combat healing, there are frankly just better ways to do it than with Close Wounds.
I'd suggest just a different approach. Good in-combat healers, i.e., ones that still let you do what you want to do and really churn out the hp, include:
- Shadow Sun Ninja (with unarmed strike optimization)
- Hellreaver
- Crusader
- Eldritch Theurge
I'd suggest, if you're still inclined to be nice about doing this, something like that. You'll have more success and still be quite a support character.
Another option is to really go hard-core support and play something like a War Weaver. Then, get some healing spells on your list (Divine Disciple, Recaster, etc.) and go to town. The War Weaver has great action economy, and you might even con your DM into letting you have Leadership if you're playing such a support character.
Alternatively, you can tell them they are wrong, direct them to forums like this, or even just tell them to try it out without being so healing obsessed. I mean, they should realize that 20-30 hp over the course of one fight isn't such a big deal. Some combat healing is important, I will never argue otherwise (though it depends a bit on the party composition), it's just that the same effect can often be gotten in a different way. Preventing an enemy from attacking you for 20 damage is operationally equivalent to healing 20 hp.