I'm not sure if I buy the "
2/3 used for ground attack so don't expect aerial victories" part. Unless there is near total air superiority or they aren't trained for air combat at all, even fighter bomber units will usually get into air combat. In the Med it was typical to send one squadron as cover for two other squadrons flying fighter bomber missions, otherwise the latter would get wiped out. Even Hurricane units flying FB missions usually got some victories through 1942.
One of the reasons I thought Merlin P-40 and Typhoon made for a pretty good comparison is that they both had a similar mission profile (mostly used as fighter bombers with some fighter sweep, CAP and escort missions in the mix) and were produced in similar numbers. Vs. ~3,300 Typhoons, there were ~2,000 Merlin engined P-40s produced (1311 P-40F and 700 P-40L) almost all built in 1941 and 1942, and almost all of them used in combat. I don't know how many were lost, does anyone? They saw heavy use, equipping 5 US Fighter groups active in the Med (33rd, 57th, 325th, 324th, 79th) , 1 independent US fighter squadron (99th FS- Tuskegee), 1 US fighter bomber group (the 27th FBG), two RAF squadrons (RAF 260 and RAAF 3 sqn) and 2 squadrons of Free French (GC II/5). Plus the US 49th FG used them in the Pacific, mostly in the Solomons area. With three squadrons per US fighter group, at the peak around mid 1943 that is a total of 23 squadrons all involved pretty heavily in combat from mid 1942 through the third quarter of 1944, but mostly in 1943. However as P-40Fs were phased in gradually, and new fighter types were phased after them, in it was usually fewer units flying the P-40F at any one time. Probably about 12-15 squadrons that had them on average through their combat life.
In the Med by my count combining US, RAF, and Free French unit victories they claimed 665 victories, about 90% of them fighters*, mostly Bf 109 and MC 202.
Most of the USAAF and British / Commonwealth units that used the P-40 F/L / Kittyhawk II were primarily flying fighter bomber units, in fact 2/3 is probably a pretty good ratio of fighter bomber vs other sorties, though maybe for some it was closer to 50/50.
Only one US Fighter group, the 325th, was primarily flying fighter escort missions and even they also did fly fighter-bomber sorties. Maybe their ratio was reversed, i.e. 2/3 escort and 1/3 fighter-bomber sorties but they flew plenty of the latter. They scored 133 victory claims in just 7 months.
33rd and 57th FG were more typical, flying P-40s in a mix of Fighter bomber, escort, and fighter sweep missions for a longer period of time,
33rd from Nov 42 to Feb 44 for 137 victory claims
57th from Aug 42 to Jan 44 for 144 victory claims
And two others, the 79th and 324th, flew mostly fighter-bomber sorties, maybe 80% of the time. Even they managed victories, 324th making 66 victory claims in just over a year with the P-40 (from March 43 to July 44) and 79th claiming 118 victories (from Dec 42 - March 44).
The only one which scored no victories was the 27th FBG, who used P-40s for five months from Feb 44 through June 44, exclusively for FB missions. They were formerly using P-51 dive bombers (A-36) and had not been trained for air combat. As did P-47s (an aircraft in some ways more comparable to the Typhoon) when the US fighter groups listed above switched to using them. 325th FG continued scoring victories at a slightly better rate flying P-47s (they shot down 133 'confirmed' with the P-40 and 154 'confirmed' with the P-47).
*For example,
according to the 325th FG records, of their 133 claims while flying the P-40, 95 of them were for Bf 109s, and 26 were for MC 202s, for 90.9% of all victories claimed.