Um Una, are you SERIOUSLY still on the fence about this? Because that bag is very perfectly you and I can't see how you could possibly still be undecided. Not to be pushy, but get that bag!!!
FWIW, I have a couple of convertible clutches and I love them. I use them all the time as my go to bag when I am out with my little ones because I can use the wristlet option. I find it much more convenient than having a cross body flopping around and much less conspicuous than having the cross body divide my chest, highlighting my great ahem tracts of land. But when I want the cross body option, I have it. So win-win.
The price is within a pretty typical range for a good leather bag. If you have few bags, then it is good to get as much variety as you possibly can out of them. This one is great because it gives you a lot of variety, it has a lot of presence and it seems very very you. (Haven't you had a couple of clothing DIY projects getting this same type of style?)