I have a weber Q100 and added a tap to our MS on the low side. Easy to remove the reg from the Q100 and adapt the fittings. But as you say can not use the small bottles like that unless to make up a fitting to connect the old reg with a Quick disconnect ??
For the Coleman, it may not be possible to remove the reg if its like one I saw. There was a made to fit pipe that was part of the burner. No fittings.
You could just not add it at DRV and do it later yourself from the high side. Can be done in the compartment at the bottles before the main reg.
Bill
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