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I recently replaced a overwind with a tripler in a 1963 Bush TV125 monochrome set.
The principle is much the same for a color set.
I found that I had low width and low EHT. I did not need to make a small overwind but sourced the tripler input from the anode of the Line-Output Valve, The boost-diode being too low in voltage.
Adding capacitance to the scan circuit to 'replace' that lost in the missing overwind cured both issues.
--It also reduced the apparent heating effect of the primary of the LOPT.
I used 470pF additional capacitance in the scan circuit.
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