Vintage car heating

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My 1928 vintage car comes fully equipped but with no interior heating, unsurprisingly. Over the years with various vintage cars this has not concerned me at all, being part of what is expected.
However, I am now hiring out for wedding use and this includes during winter, I will need some form of interior heating in the car. Looked at the 12v heaters that plug into an accessory socket but these are inadequate. Any suggestions please.

[V8 FOU]

The problem, I guess, would be the lack of a water pump on the engine to fit a conventional heater?
There are plenty of generic heaters available, so perhaps with a small electric pump hidden away you could have heating.

I've done a few things like this over the years - especially on disabled adapted cars with no rear heating.

Don't see that it would be too difficult to do with everything hidden so as not to spoil the looks.

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Thanks for reply. The car has a water pump but I have no idea about how to go about fitting a heater from it. Perhaps its time to visit a workshop.

[V8 FOU]

You will need to T into the bottom hose for the return and then a hot (pre thermostat, if it has one) outlet from somewhere on the cylinder head. The rest is plumbing!
PM if I can help further in my w/shop. Paul

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Thanks V8 for info, just a bit too far to travel to your workshop.