In summary, my answers to StephenAckworth's question is:
On the basis that engine support stand VW3054 in combination with VW313 are listed in this Porsche factory special Tools reference publication
the page dated 9/82 so presumably a supplement as book is earlier is marked as applicable (x mark) against 911 and importantly even heavier 930 etc
The Porsche factory manual content probably makes the pairing a good bet for early 911like AKAMicks 2.2
If also used in combination with the Porsche P201 four or more arm (but being conservative probably not the VW207a three arm)
P201 was shown in earlier 1965 special tools catalogue as applicable for 911 etc -- not sure when it was upgraded to 5 arm but likley later heavier engines so probably later than 2.2 or longhood era?
Maybe not cheapest option for especially if it has to be sourced via VAG SnapOn VW Audi or wherever channel they are distributed. Given the Porsche factory inclusion of them in its special tools catalogues of 60s 70s as used by the official network probably makes them a worthwhile investment given value of 911 engines these days.
Yoke P201 and VW 313 holder were in these two publications listing the minimum equipment and tools to be a Porsche approved service agent in British market circa 1972. But no stand specified so not sure what Porsche recommendation for was before VW 3054 if VW 308 not suitable.
One star service agents (as cross referenced to the glovebox booklet list that came in the maroon wallet ) didn't actually need to have yoke P201 in their minimum tool holding. Presumably one star agents carried out fairly basic servicing work of type with engine and transmission in car.
Possibly AKAMick might source tools second hand rather than pay thousands for an occasional use items.My grey VW313 is hardly new and certainly needs cleaning /light renovation.
As stated pofessionals who earn their living using things like this might know better as they use them more regularly and their businesses probably invest in tools of trade.
Hope all goes well for AKAMick -- I'd be interested in what stand tool he is using that gived rise to concerns in OP