Is it possible to set a market penetration plan without clear market segmentation?

impossibility... you must have a clear market

to set a market penetration plan without clear market segmentation means Choosing the risk of taking arbitrary measures and methods without resorting to specific methods can lead to serious consequences only if we rely on the principle of luck And any other way is not necessarily the wrong way because Everything resulting from experience may create a new path and creative thought

It is very hard or rather impossible to make a penetration in the market without a clear segmentation. 

You need to know which layer(s) or community can be engaged with your production or service and which spots can't or don't want.  

Even for the biggest brands of the world there are some spans in which they can't sell and they changed their production.

The best sample is Coca Cola, at first, they thought everyone will buy and use, but the more they went the more they found out they were wrong. Lots of people do not like the taste ( so they needed to change the product ) and some people like the tsate but they couldn't use the product due to some problems ( so they invented new products ) , and all this happened because the mother company did not want to lose the market share. 

Market segmentation can make or break a product launch - view market ... how to properly implement market segmenting before developing a marketing plan. ... You'll need to re-gather your research team and clearly define their goals ... “Beautiful product development in an ugly market segment simply makes no sense

For any plan to be successful the obejctives should be clearly defined to set the right execution strategy. 

For a market penetration plan, it is important to to first identify your target segment through market segmentation. This actually allows us to design the right penetration strategy. 

For example, the penetration strategy for a mass market brand Vs a luxury (premium) brand would be different. 

No, and that approach will lead to the negative side, you can do but you should have plan A and plan B wherein plan A will be a demo and plan B will be an actual one 

In fact no.we can not set a market penetration plan with out a clear market segmentation.

For perfect market penetration plan a series of steps should be taken

1-market identification

2-Market size calculation

3-market segmentation

4-All players market share calculation

5-Market products analysis

6-Market penetration plan construction

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