Nothing wrong with frequent oil changes I do it every a lot more than recommended too ( in the 10 to 20 hour range, more often on a new one )
Simple rule with air cooled engines that have no filters, if it looks dirty, it is so change it.....
Honda/clones us a metric parallel thread on the oil plug so a pip for a briggs will not fit.
I think its a metric M8 fine thread ( a bolt off the shelf will fit, this is how I secure my front block support to the gas tank ears. )
I am not aware of any oil plug extended but I suspect there is something on snow blower clones that could be adapted