Thanks for advice makes sense! Recess only needs to be like 4mm so assuming if I keep the thickness of template under say 6-7mm should be ok for most decent routers?
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Yes...should be...keep in mind that you will also need to select the right bit, for example, in your case a flush trim bit of the right length would work...a straight bit, no bearing, but then your template would need to use the router base as a guide...a rabetting bit will also work...
The size and shape of the template will be important...it needs to be sized appropriately to allow support of the router on the box (base) even though only part of the router base will have support.
The intent is to create as much support for the router as you can...select the method of template that provides that.
Since you are new to routing, I suggest you make LOTS of practice cuts on different types of wood...the router and bit combination will behave differently for different woods and you don't want to be surprised by how it will feel on bamboo.
Note also that bamboo will tend to splinter due to it's stringy fiber grain. Be careful as you transition from end grain to long grain (it appears the bowl has both...)
...and do not try to make complete cuts...small bites...like eating an elephant (small bite at a time)
Use your bit height adjustment to take vertical bites into your profile rather than trying to accommodate a horizontal cut. You will likely use two templates...one for cleaning the bottom hole after rough cut and then another for creating your recess...alignment of each will be important...
Ask away...lots of folks here that will help...