Ah, now you're being fussy - the seat post clamp isn't part of the frame. You might dig into your savings for a new one.
If you're going to have it powder coated, you can take the opportunity to make any other alterations to the frame you fancy - like adding or removing bottle cage bosses, mudguard eyes and so on. If it was me, I'd remove the gear lever bosses and leave it at that. If you're handy with a brazing torch, removing them would take about five minutes. Five more minutes with a file and you're done.
I've done a few modifications of this sort to frames now, including a frame whose dropouts I removed and replaced with track ends. And I have a nice man up the road who does excellent powder coating. And I know exactly how threaded headsets work and how to set them up properly.
Buy this frame and I'll "fix" it for you, powder-coat it and re-fit the headset and bottom bracket. I'll build the whole bike on it if you want.