Creating IO bundles using dynamic parameters in chisel using MixedVec

My code is as follows

class HWBLOCK(dummy_val : Int)(p : Parameters) extends Bundle{
  private val temp = Reg(Vec(dummy_val, UInt(4.W)))
  def set_temp(Index : Int, my_val : Int){ temp(Index) := my_val.U}
  def get_temp(Index : Int) : UInt = { return temp(Index) }
  override def cloneType : this.type = (new HWBLOCK(stageNumber)(p)).asInstanceOf[this.type]
}

class MyMath(p : Parameters) extends Module{
  val para = p(MyBlockKey).para
  val io = IO(new Bundle{
    val myval = Input(MixedVec((1 until para) map {i => new HWBLOCK(i)(p)})) 
})

}

Now from the peekpoketester whenever I try this

poke(dut.io.myval(1).set_temp(1,1))

I get this error

overloaded method value poke with alternatives:
[error]   (signal: chisel3.Aggregate,value: IndexedSeq[BigInt])Unit <and>
[error]   (signal: chisel3.Bundle,map: Map[String,BigInt])Unit <and>
[error]   [T <: chisel3.Element](signal: T, value: Long)(implicit evidence$10: chisel3.iotesters.Pokeable[T])Unit <and>
[error]   [T <: chisel3.Element](signal: T, value: Int)(implicit evidence$9: chisel3.iotesters.Pokeable[T])Unit <and>
[error]   [T <: chisel3.Element](signal: T, value: BigInt)(implicit evidence$8: chisel3.iotesters.Pokeable[T])Unit <and>
[error]   (path: String,value: Long)Unit <and>
[error]   (path: String,value: Int)Unit <and>
[error]   (path: String,value: BigInt)Unit
[error]  cannot be applied to (Unit)
[error]         poke(dut.io.myval(1).set_temp(1,1))

Now I have 2 questions:

1. Can I somehow avoid using private val inside HWBLOCK so that I don't have to use functions to set and get the values? The reason I am using private is because of this

The only caveat is if you are passing something of type Data as a "generator" parameter, in which case you should make it a private val. github.com/freechipsproject/chisel3/wiki/Bundles-and-Vecs

2. If I have to use private is there a way I can use peekpoketesters to access the method inside HWBLOCK class.