Playing devil's advocate here, but if you drive 20K per year and it's mostly on motorways, those are ideal conditions for avoiding DPF problems on diesel cars (and DMF problems, too, for that matter).
Also, an LPG conversion may work very well on certain cars, and not on others, depending on the installer, the specific system used, etc. As pointed out above, even in ideal circumstances with a good installer, it's not a 'fit and forget' solution.
This is strictly my 10p worth, but judging from the type of intended usage you've described, LPG seems a bigger gamble than just buying a diesel.
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