I use a fifteen year old Tamrac Extreme series combo backpack for my Bronica GS-1 6 X 7 rig. The bag holds the camera body, with lens attached, strap and hood in the main compartment. Above, in a compartment shaped like a semi-circle, I place one lens. The two side pockets hold another lens, film magazines and misc. In the front compartment I put film, filters, etc. Very efficient. Sorry, but I couldn't find a name or number for the bag.
This probably isn't the advice you're looking for, but when going "fast and light" with my P67II and a couple of lenses I tend to carry the camera over my shoulder with the lenses in a sling bag or fanny pack. Most of these bags have space for extra film, etc.
The Domke F-803 should fit. I use it for my GS1, and it holds the camera and three lenses. The P67 is a little more bulky, but the lenses you mentioned are pretty small, so I think it should fit fine, with space for extra film and other accessories.
I have a couple of Domke's. One - the F3X model - is a barely large enough shoulder bag which can handle one 6x7 body with up to the 165 lens on it, plus numerous accessories like meter, filters, etc. But it's quite comfortable to hike with. I carry the tripod rifle-style over the shoulder; and that leaves the other arm free for the trekking pole.
My other Domke is the more box-shaped F7, and includes a hip belt plus shoulder strap, and is big enough for a P67 and at least three lenses. I've even used it for a lightwt wooden 4X5 folder with lenses and filmholders PLUS a 6X9 Fuji RF at the same time. It's reasonably comfortable if distances are moderate.
For anything more serious than that I use a true external frame backpack. In the world of 6X7 that would definitely apply to carrying a 300EDIF lens and any tripod heavy and worthy enough to support it vibration-free, which happens to be the same class of tripods I use for an 8x10 view camera. So I have all the bases covered.